YUMSHOQ BUG‘DOYNING LALMIKOR YERLARDA STRESS OMILLARGA CHIDAMLI GENOTIPLARINI YARATISHDA SELEKSIYA NATIJALARI

Abstract

Under the influence of global climate change, Uzbekistan is experiencing an increase in air temperature, a decrease in precipitation, uneven distribution of rainfall during the plant growing season, and a reduction in the number of snowy days in winter. The studies revealed significant differences in the heading stage among wheat genotypes grown under rainfed conditions. It was determined that genotypes with earlier heading tended to show lower grain yield compared to late-maturing varieties. However, some early-heading varieties demonstrated relatively high grain yield. New bread wheat varieties such as KSI-96/2024/Sp-1/447/2021 (Tagob) and KSI-97/2024/Sp-1/834/2021 (Zartepa), as well as the line Sp-1/382/2021 (earlyripe), headed 6 days earlier than the standard earlymaturing variety Tezpishar, yet exhibited higher grain yield than this standard. Furthermore, the results indicated that a higher number of grains per spike and greater 1000-grain weight contribute more significantly to increased yield compared to other yield components.