Foliar Brassinolide Sprays Ameliorate Post-Silking Heat Stress on the Accumulation and Remobilization of Biomass and Nitrogen in Fresh Waxy Maize

Heat stress (HS) during grain filling is an extreme environmental factor and affects plant growth development. Foliar application of exogenous brassinolide (BR) effective practice to relieve HS injuries, but the influence on accumulation remobilization biomass nitrogen still unclear. In present study, effect foliar BR at silking stage in fresh waxy maize under ambient (28/20 °C) high (35/27 temperatures were studied a phytotron using heat-sensitive Yunuo7 (YN7) heat-tolerant Jingkenuo2000 (JKN2000) as materials. reduced ear yield by 21.8% 19.8% YN7 JKN2000, respectively, was only hybrid (6.9%) unaffected hybrid. improved yields ears (11.3% 10.9% respectively) grains (19.9% 13.2% HS, increases higher YN7. decreased post-silking 67.3% 51.8%, deposition 61.9% 50.5%, respectively. The pre- increased YN7, both JKN2000. Under hybrids. concentration harvest index it JKN2000 HS. conclusion, can injuries improving increasing index, especially Therefore, simple, feasible, efficient production worth popularizing, warmer climates.