Search or add a thesis

Advanced Search (Beta)
Home > Influence of Seed Priming on the Performance of Barely Varieties under Late Sown and Abiotic Stress Conditions

Influence of Seed Priming on the Performance of Barely Varieties under Late Sown and Abiotic Stress Conditions

Thesis Info

Access Option

External Link

Author

Tabassum, Tahira

Program

PhD

Institute

University of Agriculture

City

Faisalabad

Province

Punjab

Country

Pakistan

Thesis Completing Year

2018

Thesis Completion Status

Completed

Subject

Agricultural Technology

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/9573/1/Tahira_Tabassum_Agronomy_HSR_2018_UAF_14.09.2018.docx

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726462299

Asian Research Index Whatsapp Chanel
Asian Research Index Whatsapp Chanel

Join our Whatsapp Channel to get regular updates.

Similar


Abiotic stresses affect plant productivity by modulationg various physiological and biochemical processes. Studies were performed to evaluate the influence of seed priming on the performance of barley varieties under late sown and abiotic stress conditions. For this purpose, a series of experiments was conducted in field and green house of University of Agriculture, Faisalabad, and glass house of Texas A&M University, USA. In first pot experiment, seeds of two barley varieties (viz. Haider-93 and Frontier-87) primed with water (hydropriming), CaCl2 solution (osmopriming) and Enterobacter sp. strain FD17 culture (biopriming) were sown in pots. After seedling establishment, drought levels (viz. 80, 60 and 40% water holding capacity) were imposed. In second pot experiment, same varieties and seed priming treatments were followed except after seedling establishment salinity levels (viz. 50, 100 and 150 mM NaCl) were imposed. Third experiment was carried out in hydroponics. Seedlings were raised in sand filled polythene bags by using same varieties and seed priming treatments. After stand establishment seedlings were transplanted in hydroponics then, osmotic (-0.8 MPa using PEG) and ionic (-0.8 MPa using NaCl) stresses were imposed. In fourth experiment, same procedure was followed as in the third experiment except cadmium (Cd) toxicity stress levels (viz. 0, 8 and 12 mg L-1 water) were imposed. In fifth experiment, seeds of USA cultivar Solum were primed with water (hydropriming) and CaCl2 (osmopriming), and sown in pots. At reproductive stage two levels of heat stress viz. control (25/18°C day/night) and heat stress (35/25°C day/night) were applied. In all pot and hydroponics experiments dry seed was taken as control. The pot and hydroponics experiments were carried out using completely randomized design (CRD) with factorial arrangement having four replications, except fifth experiment in which six replications were used. In sixth experiment, same varieties and seed priming treatments, as in first pot experiment, were followed and sown in field at November 30 and December 30. The experiment was conducted by using randomized complete block design (RCBD) with split-split plot arrangement having four replications. In first and second experiments, drought and salinity decreased plant growth, yield and chlorophyll contents, and perturbed the water and nutrient relations; while, increased accumulation of osmolytes and lipid peroxidation in both barley varieties, as compared to control. Moreover, salinity increased the sodium (Na) accumulation while decreased potassium (K) accumulation. However, seed priming improved plant growth, yield, tissue water status, cell membrane stability, chlorophyll contents and accumulation of phenolics, total soluble proteins, free proline and glycine betaine contents while decreased the malondialdehyde (MDA) content in both varieties under stressed conditions, as compared to unprimed control. The gretest improvement in yield under drought was caused by biopriming; whereas, under moderate and severe salt stress by biopriming and osmopriming, respectively. Moreover, biopriming improved the grain zinc (Zn), manganese (Mn) and boron (B) contents. In third and fourth experiments, osmotic, salt as well as Cd stress decreased the seedling growth and dry biomass in both varieties while increased the osmolytes and lipid peroxidation, as compared to control. Moreover, NaCl salt stress and Cd stress increased Na and Cd contents in barley, respectively. However, seed priming enhanced seedling growth, fresh and dry biomass, chlorophyll contents, phenolics, total soluble proteins, free proline and glycine betaine contents while decreased MDA, Na and Cd contents under stressed conditions, as compared to unprimed control. Under osmotic and Cd stress biopriming was most effective, while, under salt stress osmopriming was superior in improving barley performance. In fifth experiment, terminal heat stress hampered the plant growth, yield, leaf gas exchange and chlorophyll photochemistry while increased the phenolics and lipid peroxidation, as compared to control. However, seed priming improved the photosynthesis, stomatal conductance, carboxylation use efficiency (CUE), quantum yield of photosystem II (QY), electron transport rate (ETR), chlorophyll contents, phenolics and cell membrane stability while decreased MDA content under terminal heat stress, as compared to unprimed control, and osmopriming was superior in this regard. In sixth experiment, late sowing caused a reduction in emergence, growth, grain yield, dry matter accumulation, grain filling duration, chlorophyll contents, and grain crude protein and starch contents in both barley varieties, as compared to optimum sowing time. However, seed priming improved emergence, plant height, crop growth rate (CGR), total dry matter accumulation (TDM), leaf area index (LAI), grain filling rate, yield and related traits, and grain crude protein and starch contents under both optimum and late sowing, as compared to unprimed control. The greatest improvement was caused by osmopriming followed by biopriming. The economic analysis showed that late sowing decreased economic returns as well as benefit cost ratio (BCR) which was improved by seed priming treatments. Among all, biopriming caused maximum improvement in BCR and marginal rate of return (MRR). In all pot and field experiments, variety Haider-93 performed better than Fronteir-87. In conclusion, abiotic stresses and late sowing decreased the plant growth and yield by negatively affecting plant physiological processes. However, performance of barley varieties was effectively improved by seed priming treatments under stressed conditions by improving the water relations, nutrient relations, osmolytes accumulation, photosynthesis, chlorophyll contents and decreasing the lipid peroxidation under stressed conditions.
Loading...
Loading...

Similar Books

Loading...

Similar Chapters

Loading...

Similar News

Loading...

Similar Articles

Loading...

Similar Article Headings

Loading...

78. An-Naba’/The Great News

78. An-Naba’/The Great News

I/We begin by the Blessed Name of Allah

The Immensely Merciful to all, The Infinitely Compassionate to everyone.

78:01
a. What are they asking one another about?

78:02
a. Is it about the Great News of the Time of Final Judgment and its Correlatives?

78:03
a. The one about which they are in suspicion and disputing with you – O The Prophet.

78:04
a. But no!
b. They will soon know the truth of its reality!

78:05
a. And then, oh no!
b. They will soon know the truth of its reality!

78:06
a. Have WE not made the earth a resting place like a bed for you,

78:07
a. and set the strong mountains as its pegs?

78:08
a. And WE created you in pairs,

78:09
a. and made your sleep for resting,

78:10
a. and made the nighttime a covering,

78:11
a. and made the daytime for your livelihood.

78:12
a. And WE built above you seven celestial realms - strong, solid, and firm,

Surah 78 * An-Naba’ 707

78:13
a. and set therein Sun as a luminous lamp,

78:14
a. and sent down abundant water from the water-laden clouds,

78:15
a. so that WE may bring out thereby grain and vegetation,

78:16
a. as well as gardens of dense growth.

78:17
a. Surely the Time of Division is an Appointed Time.

78:18
a. The Time when the Trumpet will...

Investigating Peace Education and Peace Culture Activities in the Curriculum of Secondary Schools of Pakistan

Peace has always been a fundamental need of humanity and social beings. Despite of all the worldly, scientific and materialistic progress in almost every domain of life, eternal peace is missing. Peace education is a process of achieving peace, at personal, inter-personal, national and international levels, through education, focusing on promoting universal brotherhood, fraternity, global citizenship and the culture of peaceful co-existence. This article aims to institutionalize peace education and culture at secondary government schools of Lahore, Pakistan. A questionnaire focusing on peace education and inculcating of peace culture was used for data collection. The data revealed peace education is implicitly taught but it is not practiced in schools and hence, is not part of school curriculum. Also peace culture-related activities are missing in the school curriculum and there is a dire need of such activities.

Biodiversity, Faunistic Studies of the Family Sphingidae: Lepidoptera from Pakistan and Azad Kashmir With Their Cladistic Analysis

Twenty-nine species belonging to twenty-one genera representatives of six tribes viz., Smerinthini, Sphingulini, Acherontiini, Dilophonotini, Macroglossini, and Choerocampini of three subfamilies viz., Smerinthinae, Sphinginae and Macroglossinae of the family Sphingidae with fifteen newly recorded species from different areas of Pakistan and Azad Kashmir are described in detail with special reference to their head, wing venations, fore and hind wings and male and female genital complex where available. In subfamily Smerinthinae, two tribes, the tribe Smerinthini includes seven genera with seven species viz. Smerinthus kindermannnii Lederer, Marumba dyras Walker, Sataspes infernalis Westwood, Leucophlebia lineata Westwood, Clanis deucalion Walker, Clanidopsis exausta Butler, and Polyptychus dentatus Cramer, In tribe Sphingulini only one genus and one species presented, Dolbina grisea Staudinger. The second subfamily Sphinginae includes only one tribe Acherontiini, with two genera, Agrius and Acherontia. In the genus Acherontia two species included A. lachesis (Fabricius), and A. styx Westwood, while in genus Agrius only one species Agrius convolvuli (Linnaeus), presented. The third subfamily Macroglossinae contains three tribes with eleven genera and eighteen species. In five genera having one species of each, Cephonodes hylas (Linnaeus), Nephele hespera (Fabricius), Daphnis nerii (Linnaeus), Gnathothlibus erotus (Cramer), and Pergesa acteus (Cramer). In remaining six genera, Macroglossum with three species M. belis (Linnaeus),M. nycteris Kollar, and M. stellatarum (Linnaeus), Acosmeryx with two species A. anceus Rothschild & Jordan, A.sericeus (Walker), Deilephila with two species D. elepenor (Linnaeus), D. rivularis (Biosduval), Hyles with two species Hyles gallii (Von Rottemburg), Hyles livornica (Esper), Hippotion with two species Hippotion celerio (Linnaeus), Hippotion rosetta (Swinhoe), Theretra with also two species Theretra alecto (Linnaeus),and Theretra oldenlandiae (Fabricius). All the taxa including new records are compared with their closest allies and a key to the subfamilies, genera and species are formulated on the basis of reliable characters, which help readily identify the taxa. The cladistic analysis of the representatives of the family Sphingidae is also attempted using their apomorphic characters. The biodiversity of all the included taxa is also discussed and a map of Pakistan is given to show the distributional range and diversity of the above taxa.