Li Qing-Fang, Ma Cheng-Cang, Shang Qi-Liang
Department of Biology, Huaibei Coal Normal College, Huaibei 235000, Anhui, China.
Ying Yong Sheng Tai Xue Bao. 2007 Mar;18(3):531-6.
With pot experiment, this paper studied the effects of silicon supply on drought-resistance capability of maize plant. The results showed that under mild and severe drought stress, supplying silicon could increase the plant biomass by 31.1%-33.3% and 23.7%-40.5%, respectively, compared with the control. Silicon enhanced the net photosynthetic rate by 10.9% --28.8%, increased the chlorophyll content and POD, SOD and CAT activities by 4.0% -11.9%, 6.4% -26.4%, 17.8% -26.8% and 3.2%-33.5%, respectively, and restrained the increase of leaf plasma membrane permeability and MDA content. Correlation analysis indicated that there was a significant correlation between plant dry matter accumulation and diurnal photosynthetic cumulates (r = 0. 9357, P < 0.05), demonstrating that the enhancement of photosynthesis under effect of silicon supply was the main factor inducing the increase of dry matter accumulation under drought stress. The higher antioxidative enzyme activities with silicon supply lightened the injury effect of free radicals, being another important factor inducing the increase of plant drought-resistance capability.
通过盆栽试验，研究了硅供应对玉米植株抗旱能力的影响。结果表明，在轻度和重度干旱胁迫下，与对照相比，供应硅可使植株生物量分别增加31.1% - 33.3%和23.7% - 40.5%。硅使净光合速率提高了10.9% - 28.8%，叶绿素含量、POD、SOD和CAT活性分别提高了4.0% - 11.9%、6.4% - 26.4%、17.8% - 26.8%和3.2% - 33.5%，并抑制了叶片质膜透性和MDA含量的增加。相关性分析表明，植株干物质积累与日光合积累量之间存在显著相关性（r = 0.9357，P < 0.05），表明硅供应作用下光合作用的增强是干旱胁迫下干物质积累增加的主要因素。供应硅时较高的抗氧化酶活性减轻了自由基的伤害作用，是诱导植株抗旱能力增强的另一个重要因素。
