大田条件下模拟UV-B辐射滤减对水稻生长及内源激素含量的影响

Influences of reduced UV-B radiation on growth and endogenesis hormone contents of rice (Oryza sativa L.) under field conditions

对大田栽培条件下人工模拟的UV-B辐射滤减环境对晚稻品种“协优432”的叶绿素含量、株高、内源激素吲哚乙酸(IAA)、脱落酸(ABA)、赤霉素(GA3)、玉米素(Zeatin)含量的影响研究结果表明,在正常日光处理组与UV-A滤光组之间叶绿素a含量变化显著;正常日光处理组与UV-A滤光组、UV-A+UV-B滤光组之间株高无明显变化。UV-A+UV-B滤光组IAA、GA3、Zeatin含量分别比正常日光处理组降低了40.42%、48.60%、36.21%;分别比UV-A滤光处理组降低了36.52%、70.94%、54.54%。单因素方差分析及多重比较结果显示,UV-A+UV-B滤光组与正常日光处理组之间IAA、GA3含量差异显著;UV-A+UV-B滤光组与UV-A滤光处理组之间GA3、Zeatin含量差异显著。UV-A+UV-B滤光组ABA含量比正常日光处理组降低了29.74%,比UV-A滤光处理组降低了5.19%,经单因素方差分析后发现差异不显著。

The effects of artificially simulated UV-B radiation reduction under field conditions at Qianyanzhou region of Jiangxi Province on the growth and the contents of chlorophyll and endogenesis hormones, indoleacetic acid （ IAA）, abscisic acid （ABA） ,gibberellinA3 （GA3 ） and zeatin （Z）, of rice variety ＇ Xieyou 432＇ were studied. The results indicate that the UV-B radiation reduction induces the contents of chlorophyll change significantly, but no difference among the ambient control and treatments of UV-A and UV-A ＋ UV-B is observed. The contents of IAA, GA3 and Z with the UV-A ＋ UV-B treatment are significantly lower than those of ambient control, decreasing by 40.42 %, 48.60 %, 36.21%, respectively . Compared with the UV-A treatment the contents of IAA, GA3 and Z in the UV-A ＋ UV-B treatment are decreased by 36.52 %, 70.94 % and 54.54 %, respectively. The ABA content of UV-A ＋ UV-B treatment decreases by 29.74 % compared with that of the ambient control,and by 5.19 % compared with the UV-A treatment. The results also indicate that reduced UV-B radiation has changed the contents of the four endogenesis hormones of the investigated rice cultivar, and accordingly may have adverse effects on the process of growth and development of rice.