نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه زراعت و اصلاح نباتات دانشکدگان کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران
2 گروه زراعت و اصلاح نباتات دانشکدگان کشاورزی و منابع طبیعی دانشگاه تهران، کرج ، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Stem reserve remobilization is a key trait for maintaining yield stability under drought-stress conditions. An experiment was conducted under greenhouse conditions to investigate the relationship between stem reserve remobilization, grain-filling parameters, and drought resistance in spring wheat cultivars. The first-stage results indicated that, on average, drought stress reduced grain yield by 35% and grain number by 31% among the twelve studied cultivars. These reductions were more evident in the sensitive cultivars. Additionally, drought stress increased remobilization efficiency by 4% while reducing the total remobilization amount, primarily due to a 29% decrease in the remobilization of the lower internodes. In the second stage of the experiment, Shabrang (absolute and relative resistant) and Chamran (absolute and relative sensitive) cultivars were chosen based on the results of the first stage. The results indicated that yield reduction under drought stress conditions was primarily due to decreases in grain number and final grain weight, which were influenced by reductions in the active grain-filling period and grain-filling rate. Correlation analysis revealed a significant positive relationship between remobilization, the active grain-filling period, and the grain-filling rate under drought stress conditions (P < 0.01). These results emphasize the importance of selecting and breeding wheat cultivars with high remobilization capacity and a longer grain-filling period under drought-stress conditions, which can be an effective solution for improving yields in water-limited areas.
کلیدواژهها [English]
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