杂交中稻齐穗后叶片SPAD值衰减对再生力的影响  

Effects of the Decreased Index of SPAD Value of Leaf After Full Heading on Ratooning Ability

作　　者：徐富贤[1] 熊洪[1] 张林[1] 郭晓艺[1] 朱永川[1] 周兴兵[1] 刘茂[1] 

机构地区：[1]四川省农业科学院水稻高粱研究所,四川泸州646000

出　　处：《中国农业科学》2009年第10期3442-3450,共9页Scientia Agricultura Sinica

基　　金：西南水稻创新体系建设;四川省农科院青年基金;粮食科技丰产工程(2006BAD02A05);农业科技成果转化资金(2006GB2F000256)

摘　　要：【目的】探明影响再生力的主作关键植株性状,为杂交水稻及其再生稻的高产育种与栽培提供参考。【方法】以18个杂交中稻品种为材料,在大田高产栽培条件下,通过相关、回归与通径分析,研究了杂交中稻植株性状与再生力关系及主作和再生总体高产组合的穗粒结构。【结果】活芽率、发苗力、再生稻有效穗和产量4个性状是代表品种再生力的关键因子,增加有效穗是进一步提高再生稻产量的重要途径;穗粒数、叶颖花比、叶粒数比、叶粒重比、LAI衰减指数和SPAD值衰减指数分别与活芽率、发苗力、再生稻有效穗和产量呈显著或极显著相关,其中仅有头季稻齐穗期至成熟期叶片SPAD值衰减指数对活芽率、发苗力、再生稻有效穗和产量的偏相关均达显著以上水平;同一个组合同时实现头季稻和再生稻均分别达到最高产量的可能性小,两季总产同时满足理论产量达11.5t·hm-2和产量潜力达14t·hm-2的高产组合的主作群体主要特征最佳取值范围:穗粒数为160～190粒,叶粒重比0.0737～0.0827cm2·mg-1、SPAD值衰减指数0.4029～0.5409、有效穗232.12万～249.40万/hm2、结实率81.54%～85.74%、千粒重28.58～30.07g、单穗重4.13～4.43g。【结论】再生稻进一步高产的主攻目标是增加有效穗,头季稻齐穗到成熟叶片SPAD值衰减指数可作为鉴定再生力的新指标,中等偏大穗品种是中稻-再生稻总体高产的重要特征。【Objective】 Many studies on the source-sink characters of high-yielding combinations of main crop or ratooning rice,but there were few studies on high-yielding combinations total yield of main crop and ratooning rice. In this paper,the relationship between the decreased index of SPAD value of leaf from full heading to harvesting （DISVLFHH） and ratooning ability,the plant characters of main crop for high yielding combinations of main crop and ratooning rice were studied,which could provide a theoretical and practical basis for improvement of high yield breeding and cultivation of hybrid rice. 【Method】 The experiment was conducted with eighteen mid-season rice combinations grown in a traditional high yield cultivation system,in a randomized block design with 3 replications. The results were analyzed through variance,correlation,regression and path analysis. 【Result】Alive bud rate,born bud rate,effective panicles and grain yield of ratooning rice were the key traits of ratooning ability,which was a an important approach for further high yield of ratooning rice by increasing effective panicles.There were significant or highly significant relationships between spikelets per panicle,the ratio of leaf area to spikelets,the ratio of leaf area to grains,the ratio of leaf area to grain weight,decreased LAI index,DISVLFHH of main crop and alive bud rate,born bud rate,effective panicles,grain yield of ratooning rice,and the partial correlation coefficient between only DISVLFHH among all trais and alive bud rate,born bud rate,effective panicles,grain yield of ratooning rice got significant at 0.05 level. As for one variety,it＇s impossible that both main crop and ratooning rice could get top grain yield. The high-yielding combinations for 11.5t per ha of the theory grain yield and 14t per ha of potential grain yield for main crop and ratooning rice would have the following source-sink characteristics：160-190 spikelets per panicle,the ratio of leaf area to grain weight 0.0737-0.0827 cm^2 per mg ,DISVLFHH 0.4

关 键 词：杂交中稻 再生力 SPAD值衰减指数 库源特征 

分 类 号：S511.32[农业科学—作物学]