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玉米子粒灌浆后期的叶光合速率与子粒产量成正相关。现在育种家多用绿叶时间长短作为叶光合速率大小的间接指标,但是绿叶时间长短因材料的不同不见得都和叶光合速率成正相关,这样选择的准确性较差。而美国依利诺斯大学农学家比劳(B—eLOw)发现,多数玉米杂交种在子粒灌浆后期将穗子去掉,叶片就会加速死亡,而且有高产潜力的玉米杂交种的死亡速率大大低于其他杂交种。“F-S 854”是一个高产杂交种,产量达370蒲式耳/英亩(约合1541.56公斤/亩),在去穗试验中,其他杂交种叶片都死亡后,它的叶片能维持正常。因
The photosynthetic rate of maize grain at the late grain filling stage was positively correlated with grain yield. Now breeders often use green leaves as an indirect indicator of leaf photosynthetic rate, but the length of the green leaves due to the different materials are not necessarily and leaf photosynthesis rate is positively correlated, so the accuracy of the selection is poor. However, B-eLOw, an agronomist at the University of Illinois in the United States, found that most maize hybrids removed the ears during the late grain filling stage and accelerated the death of the leaves and significantly reduced the rate of death of maize hybrids with high yield potential Hybrids. “F-S 854” is a high-yielding hybrid that yields 370 bushels / acre (about 1541.56 kg / acre). Its leaves remain normal after the other hybrids have died in the spike test. because