水稻幼苗生长对弱光胁迫的响应及相关分析  

The Response and Correlation Analysis of Rice Seedlings Growth to Low-light Stress

作　　者：杨东[1,2] 段留生[1] 谢华安[2] 黄庭旭[2] 

机构地区：[1]中国农业大学作物化学控制研究中心,北京100094 [2]福建省农业科学院水稻研究所,福州350018

出　　处：《中国农学通报》2011年第5期70-79,共10页Chinese Agricultural Science Bulletin

基　　金：公益性行业专项"南方早籼稻品质改良与抗逆栽培技术研究与示范(华南稻区)"(nyhyzx07-001-05);福建省属公益类科研院所基本科研专项计划"优质;抗病;高产水稻新品种选育与生态适应性研究"(2009R10026-1);福建省科技重大专项"粮食作物育种技术研究"(2008NZ02);福建省财政专项"福建省农业科学院科技创新团队建设基金"(STIF-Y04)。

摘　　要：耐弱光性不同的水稻品种对光照条件反应不同,确定水稻耐弱光鉴定指标,可以快速有效地从大量种质资源中筛选耐弱光的水稻品种,提高品种耐弱光选择效率。试验对不同基因型的61份水稻品种(品系)于苗期进行遮光处理,分别研究各品种在不同光照下的叶龄、苗高、根长、地上部干重、根干重、根冠比、根体积、叶绿素(SPAD值)、单株重的变化,并对各性状的相对指数进行相关及通径分析。试验结果表明,在55%遮光条件下,不同水稻品种的叶绿素含量均增加,苗高变化不一,多数品种的根长、叶龄、根体积、根干重有不同程度的下降,少数品种的根长、叶龄、根体积、根干重增加,各品种地上部干重和单株重均有不同程度的下降;而且,弱光下地上部干重、根干重、根长的相对指数与单株重相对指数直接通径系数分别为0.7592、0.2105、0.0346,相关系数为0.9034、0.7634、0.6862,可见,弱光下的地上部干重相对指数是鉴定水稻耐弱光性的可靠指标,弱光下的根干重和根长相对指数可作为耐弱光性鉴定的重要辅助指标。Rice variety with different low-light-resistant ability had different response against light. So low-light-resistant rice could be screened from a large number of germplasm resources of rice varieties resistant to low light quickly and effectively, and then the selection efficiency was promoted. 61 rice varieties （inbreed lines） with different genes were treated by shading at seedling stage. The change of leaf age, seedling height, root length, shoot dry weight, root dry weight, root-shoot ratio, root volume, chlorophyll content （SPAD） and total dry weight per plant were studied. Correlation analysis and path analysis of 9 characters were carried out too. The results showed that chlorophyll content of all varieties was increased by 55% shading. Seedling height of some varieties were improved, the others were dropped. Most varieties of root length, leaf age, root volume, root dry weight decreased at different degrees, a few varieties were increased. Shoot dry weight and total dry weight per plant of all varieties decreased at different extents. Moreover, the direct path coefficient that the relative index of shoot dry weight, root dry weight and root length to total dry weight per plant under low light environment were 0.7593, 0.2105 and 0.0346, respectively, and the correlation coefficients were 0.9034, 0.7634 and 0.6862, respectively. It was suggested that the relative index of shoot dry weight under low light environment might be used as believable indicator to identify the low light tolerance of rice, and the relative index of root dry weight and root length under low light environment could be used as assistant indicator.

关 键 词：水稻 苗期 弱光胁迫 相关分析 

分 类 号：S511[农业科学—作物学]