Relationship between yield and its components in bread wheat (Triticum aestivum L.) genotypes in drought and non-drought stress conditions
Subject Areas : New Finding in AgricultureA. Golparvar 1 , H. Madani 2 , M. Rasouli 3
1 - Assist. Prof., Islamic Azad University, Khoorasgan Branch, Iran
2 - Associ. Prof., Islamic Azad University, Arak Branch, Iran
3 - Ph. D. Student in Plant Breeding, Islamic Azad University, Sciense and Research Branch, Tehran, Iran
Keywords: Correlation analysis, Path analysis, Drought stress, Bread Wheat, step-wise regression,
Abstract :
In order to evaluation and determination of the most effective traits in improvement grain yield of bread wheat genotypes, an experiment conducted using 320 genotypes in the research field of agriculture institute of Shahrekord in 2006. Genotypes were cultivated in augmented design along with Karaj1 and Sardari as the check cultivars in both stress and non-stress conditions. Grain yield and 10 related feature of traits were measured in this research. Correlation coefficient analysis showed that in both condition all traits except awn length and in non-stress condition spike weight had positive and significant correlation with grain yield in 1% probability level. By using step-wise regression analysis in stress condition five traits and in non-stress condition three traits entered to the model that verified 97.8% and 96.5% of grain yield variation, respectively. Path analysis for grain yield indicated that in stress condition biological yield, harvest index and grain number per spike and in non-stress condition biological yield and harvest index had the most positive and direct effect on plant kernel yield. Grain number per spike in stress as direct and in non-stress condition as indirect affect positively and significantly on increase grain yield. Therefore, results of research indicate that use of these traits suggest as indirect selection criteria in order to improve grain yield of bread wheat genotypes in both stress and non-stress conditions.
1- اهدائی، ب. 1377. تغییرات ژنتیکی برای ذخیره ساقه و انتقال آن به دانه در گندم معمولی بهاره تحت شرائط خشکی انتهائی. چکیده مقالات پنجمین کنگره زراعت و اصلاح نباتات ایران. 656 صفحه.
2-حق پرست، ر. 1374. انتخاب برای مقاومت به خشکی در گندم. پایان نامه کارشناسی ارشد اصلاح نباتات. دانشگاه تبریز.
3- رحیمی، م. 1372. بررسی تغییرات ژنتیکی برخی از صفات مرتبط با مقاومت به خشکی و رابطه آنها با عملکرد در جو. پایان نامه کارشناسی ارشد اصلاح نباتات. دانشگاه تبریز.
4- نورمند مؤید، ف.،رستمی، م. و قنادها،م. (1377). تعیین بهترین شاخص مقاومت به خشکی در گندم نان. چکیده مقالات پنجمین کنگره زراعت و اصلاح نباتات ایران. صفحه 243.
5- نیکخواه، ح. 1378. ارزیابی و مطالعه توارث پذیری مقاومت به خشکی در گندم نان. پایان نامه کارشناسی ارشد اصلاح نباتات. دانشگاه تهران .
6-Clarke, J. M., Romagosa, I. and Depauw, R. M. 1991. Screening durum wheat germplasm for dry growing conditions: morphological and physiological criteria. Crop Sci. 31:770-775.
7-Dawari, N. H. and Luthra, O. P. 1991. Character association studies under high and low environments in wheat (Triticum aestivum L.). Indian. J. Agric. Res. 25:68-72.
8- Dewey, D. R. and Lu, K. H. 1959. A correlation and path-coefficient analysis of components of crested wheat-grass and production. Agron. J. 51:515-518.
9- Farshadfar, E., Galiba, G., Kozsegi, B. and Sutka, J. 1993. Some aspects of the genetic analysis of drought tolerance in wheat. Cereal Research Communications. 21:323-330.
10- Hill, J. Ortis, W. Wagoir, W. and Stolen, O. 2002. Effectiveness of indirect selection for wheat yield in a stress environment. Plant Breeding Abstracts. 98(2): 305-309.
11- Keim, D. L. and Kronstad, W.E. 1981. Drought responses of winter wheat cultivars grown under field stress conditions. Crop Sci. 21:11-14.
12- Khan A. S., Khan., M. K. R. and Khan, T. M. 2005. Genetic analysis of plant height, grain yield and other traits in wheat (Triticum aestivum L.). Intern. J. Agric. Bio. 2: 129-132.
13- Nachit, M. M., Ketata, H. and Acevedo, E. 1991. Selection of morpho-physiological traits for multiple abiotic stresses resistance in durum wheat . Physiology breeding of winter cereal for stressed mediterranean environments .PP: 391-400.
14- Pathak, E., Williams, J. H. and Carter, T. E. 1986. Correlation and path analysis in wheat under high temperature and moisture stress conditions. Wheat Information Service. 62:68-73.
15-Rosielle, A. T. and Hambelen, J. 1981. Theoretical aspects of selection for yield in stress and non-stress environments. Crop Sci. 21:943-945.
16- Sharma, S. N., Sain, R. S. and Sharma, R. K. 2002. Gene system governing grain yield per spike in macaroni wheat. Wheat. Infor. Service. 94: 14-18.