Search or add a thesis

Advanced Search (Beta)
Home > Genetics of Qtls Related to Drought Tolerance in Upland Cotton

Genetics of Qtls Related to Drought Tolerance in Upland Cotton

Thesis Info

Access Option

External Link

Author

Muhammad Waqas Amjid

Program

PhD

Institute

University of Agriculture

City

Faisalabad

Province

Punjab

Country

Pakistan

Thesis Completing Year

2014

Thesis Completion Status

Completed

Subject

Botany

Language

English

Link

http://prr.hec.gov.pk/jspui/handle/123456789/1108

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726326320

Asian Research Index Whatsapp Chanel
Asian Research Index Whatsapp Chanel

Join our Whatsapp Channel to get regular updates.

Similar


Drought is one of the major abiotic stresses affecting crop plants. Molecular genetics integrated with conventional breeding techniques has an immense potential to improve quantitative traits related to drought tolerance. Thirty-seven upland cotton (Gossypium hirsutum) genotypes/cultivars were screened for drought tolerance. Four contrasting genotypes/cultivars for drought tolerance (FH 207 and FH 910 tolerant while FH 901 and CIM 443 were susceptible) were selected. The F1, F2, BC1 and BC2 populations along with their respective parents were evaluated in the field under well watered and drought stress conditions for physiological and morphological traits. In generation means analysis, all the traits exhibited additive, dominance and interaction type of gene action. In generation variance analysis additive into environmental or additive, dominance and environmental models were fit for most of the traits except stomatal size and stomatal frequency which exhibited interaction. In correlation studies number of bolls per plant correlated positively with plant height and relative water content under well watered and drought stress conditions in both crosses. Relative water content correlated positively with cell membrane stability and correlated negatively with excised leaf water loss under drought stress. Cell membrane stability correlated negatively with excised leaf water loss under drought stress. Stomatal size correlated negatively with stomatal frequency under well watered and drought stress conditions. Fibre fineness correlated negatively with fibre length under drought stress. The F2 population of the cross FH-207 × FH-901along with the parents was also grown in pots under drought stress for QTL mapping study. The drought stress was developed by using restricted irrigation. A total of 2365 SSR primers were used to identify polymorphism between the two parents. In the primers, 100 were found polymorphic which were used to score F2 population for QTL mapping. Nine QTLs were identified on seven chromosomes. Two QTLs were identified for relative water content on chromosome A5. Two QTLs were identified on chromosome A7, one for plant height and one for excised leaf water loss. One QTL was identified for cell membrane stability on chromosome A1, one for number of bolls per plant on chromosome A10, one for boll weight on chromosome D11, one for stomatal size on chromosome A6 and one for stomatal frequency on chromosome A13. Theses QTLs may be used to breed drought tolerant cotton cultivar through marker assisted selection.
Loading...
Loading...

Similar Books

Loading...

Similar Chapters

Loading...

Similar News

Loading...

Similar Articles

Loading...

Similar Article Headings

Loading...

کرپشن

کرپشن ،نجی مفادات اور غداری

                ہر وہ شخص غدار ہے جو اپنے ذاتی مفاد کیلئے پھر غیر آئینی طریقے سے پاکستان کے آئین کو منسوخ کردے یا پھر کسی بھی قسم کی کرپشن جو ملک کیلئے بدنامی کا باعث بنے ،خطرہ بنے ،کسی آئین کو معطل کرے ،یا کسی بھی سازش میں بھی شامل ہو تو وہ ملک کا غدار ہے۔ یہ ایک ایسی لعنت ہے جو کسی بھی ملک کی بنیادوں کو کھوکھلا کردیتی ہے۔

                یہ زمین جس پر ہم رہتے ہیں یہ ہمارے لیے ہماری ماں جیسی ہے پاک زمین کی گود میں پرورش پاکر پھر اسی سیغداری کرنا ،ایسے حالات  میں جہاں غدار موجود تھے وہاں وطن پر مر مٹنے والے بھی موجود تھے مگرجو نقصان وطن کو ان غداروں سے ہوا وہ ملک کیلئے شرمندگی کا باعث بنتارہا۔وطن سے بغاوت کرنے والے کچھ لوگوں نے وطن اور دین کی پرواہ نہ کی اور صرف چند پیسوں کی خاطر اپنا ایمان بیچ ڈالا اور جہاں ان کو وطن کی حفاظت کیلئے کھڑے ہونا تھا وہ وطن کے غداروں کی صف میں شامل نظر آئے۔اکثر اوقات ہم غداروں کو پکڑپانے میں اتنی دیر کردیتے ہیں جب تک وہ ہماری بنیادوں کوکھوکھلا کرچکے ہوتے ہیں۔

                ناطق نے بھی ناول میں ایسے ہی ایک واقعے کو بیان کیاہے کہ جب ’’ضامن‘‘کہانی کا مضبوط کردار وزارت خارجہ کے دفتر میں چودھویں سکیل کے کلرک کی حیثیت سے کام کرنے لگا تو اس کے ساتھ کچھ ایسے حالات پیش آئے جن سے وہ لاعلم رہا کے کہیں نہ کہیں اسے ملک کے خلاف کام کرنے کی سازش میں شامل کیا جاتا رہا ہے۔یقینااس پر قلم اٹھانا مصنف کیلئے بہت بہادری کا کام ہے۔آج سے پہلے بھی اردو ناولوں میں ملکی حالات پر بات کی...

IMPLEMENTASI KEBIJAKAN SISTEM ZONASI PADA PENERIMAAN PESERTA DIDIK BARU (PPDB) 2019/2020 DI KOTA YOGYAKARTA

The acceptance of new students (PPDB) using the zoning system was first implemented in Yogyakarta in 2018/2019. This zoning system aims to equalize education and improve the quality of education. This research was conducted to find out how the zoning system policy in Yogyakarta city under the auspices of the Yogyakarta City Education Office. This research uses qualitative approach with case study method. The results of the study showed that the zoning system in Yogyakarta has changed from the previous year. In 2019/2020 the zoning system provides a 10% chance of superior seeds, 30% of school zones, 10% of poor learners, 40% of quality pathways, 5% of out-of-school zoning pathways, and 5% of special pathways such as prospective learners whose parents moved from other regions to Yogyakarta. With this zoning system, the whole community has the opportunity to get a good quality education.

Cultivar Resistance and Chemical Control of Tomato Fruitworm, Heliothis Hb. Armigera on Tomato Lycopersicon Esculentum Mill.

During present investigation experiments were conducted on the pest phenology on tomato crop for three years (1989-91), at Pes t Peshawar. Institute, Tarnab, Research Agricultural pehnological studies comprised egg, larval population dynamics, spatial distribution analysis and development of larval time sequential sampling plan. On population dynamics, the regression equation for egg and/or larval population development showed feeble negative p values during 1989 and 1991, and positive p values All equations showed poor correlation during the year 1990. coefficient. The sequent ional sampling programme data showed two distinct population configurations i.e. outbreak and endemic. The differences in growth rates between types were small at first. , A total of ca . 6 samples reached to its peak and then declined. (each week) would be adequate to detect type of configuration in any one year. Spatial pattern of H. armigera Hb . egg distribution during the study revealed that index of dispersion (I.D.) values were more than 1 in 1990 and 1991. However, in 1989 the l.D. values oscillated around 1. Moreover, most of the green''s index (G.I.) values were positive which confirm the negative binomial The I.D. values of the distribution of Hÿ_ armigera Hb. eggs. spatial pattern of H. armigera Hb. larval distribution were mostly higher than 1. Therefore, larval distribution also fits negative binomial distribution. The results of discriminating doses of potassium fertilizer on egg and larval population, and the fruit infestation showed that there was no significant effect of fertilizer on the uptake of tomato plants, on egg and larval population, and on the infestation of tomato. To compare relative efficacy of nine insecticides, one application was done during the year (1989), and three during each remaining two years of study i.e. 1990 and 1991. All the insecticides were found successful in keeping the larval population below outbreak configuration level upto 15 days after spray. ( viii ) S ! Consolidation of study data over a period of three years revealed that Thiodon was statistically the most effective wiLh 77.88 percent larval mortality, followed by Folidol M (75.96%), Sevin (69.32%), Thuricide (67.12%), Dimilin (66.38%), Edcidin (65.32%) and Atabron (59.85%). Permasect and Azodrin were significantly the mortality larval and 54.66% 58.55% with effective least level). The resulLs also respectively (cdii = 17.03 at 0.05 indicated a tendency in the reduction of effectiveness of Folidol M, Azodrin, Dimilin and Thuricide over a period of three years which might probably be due to enhancement in the degree of tolerance developing in H. armiqera Hb . Cluster analysis on the interactions of eggs and larval per plant, percent fruit damage and yield in Kg per plant of 65 toniaLo cultivars gave five cluster groups. Frequency-wise cluster analysis showed two varieties in group A (3.08%), two in B (3.08%), one in C (1.53%), fifty nine in D (90.78%) and one in E (1.53%). In the regression analysis of correlation between characteristics of 65 varieties and H- armiqera Hb. infestation, step-wise model was fitted, the correlation between infestion gave negative dependence larval infestation (-0.3251) with poor correlation (-0.2558) . Similar coefficient results were obtained for correlation between yield and number of larvae per plant (b=0.4Q04, r=0 . 0893 ) The step-wise model correlation between larval chemical/physical population and parameters gave negative dependence on trichome length (-0.0100) and iron content (-15494E- 04) and positive dependence on zinc (0.0028) and vitamin C (0.0279). Cluster analysis on the interaction of larval duration, pupal duration, adult longevity, duration of life cycle, larval and pupal weight and survival to adult stage also gave five cluster groups . Frequency-wise cluster analysis showed two varieties in group A (3.08%), four in B (6.15%), fifty two in C (84.62%), three in D (4.62%) and one in E (1.53%). Tiny Tim being moderately resistant cultivar, was placed in group E. . The results indicated that integration of resistant cultivar, Tiny Tim and Bacillus thurinqiensis had maximum effect on larval mortality and minimum percent fruit infestation, it was followed by accession 87-11(1) also a resistant line, while the maximum infestation was recorded on the most susceptible cultivar, Big long. The host range and average number of larvae/plant of H. armiqera Hb were recorded on soybean (1.63), gram (4.80), tomato (0.31), tobacco (1.64), maize (0.81), sunflower (0.07), okra (0.67), potato (1.92) and burseem (0.90). Gram was observed to be the most favourable host plant of this pest