摘要
Abstract
A pot experiment was conducted to using Huanghuazhan as the test material.At 19 after transplantation,the potted plants were placed in an artificial climate chamber equipped with sunshine function and natural temperatures simulate for drought stress treatment.Meanwhile,a subset of the potted plants with exogenous application of nano-zinc fertilizer at a concentration of 50 mg/L one day prior to the onset of drought stress treatment.This study aimed to explore the effects of nano-zinc fertilizer application on rice yield and its component factors under drought stress conditions,and to preliminary reveal its mechanism of action by analyzing agronomic traits such as plant height and dry matter weight,as well as physiological traits related to photosynthesis.The results showed that during the vegetative growth stage,drought stress had no significant effect on rice seed setting rate and 1000-grain weight,but significantly reduced the number of effective panicles and grains per panicle,ultimately leading to a substantial decrease in rice yield by 49.65%.Under drought stress conditions,exogenous application of nano-zinc fertilizer significantly alleviated the drought-induced decline in the number of effective panicles and grains per panicle,reducing the yield loss to 28.93%.It also significantly increased rice plant height,root length,and dry matter weight of both the aboveground and root parts.Additionally,it significantly improved leaf stomatal conductance,transpiration rate,and net photosynthetic rate,significantly enhanced the activity of superoxide dismutase,peroxidase,catalase,and ascorbate peroxidase in leaves,and significantly reduced the content of hydrogen peroxide and malondialdehyde in leaves.These results indicate that nano-zinc fertilizer reduces oxidative damage to rice leaves under stress conditions by enhancing the activity of antioxidant enzymes,thereby improving photosynthetic characteristics,promoting material accumulation,and ultimately mitigating the negative impact of drought stress on rice yield.关键词
水稻/纳米锌/干旱胁迫/生理机制Key words
rice/nano-zinc/drought stress/physiological mechanism分类
农业科学
