【摘要】 本研究旨在揭示华南晚籼杂交稻叶片SPAD值一般配合力及遗传参数的动态变化规律，为华南杂交水稻的高产高效新品种培育提供相关的科学依据。以华南地区生产上广泛应用的3个籼稻不育系和6个籼稻恢复系配置了18个不完全双列杂交组合，分析不同发育阶段叶片SPAD值及其一般配合力及遗传效应的动态变化规律。结果表明：杂种及其亲本叶片SPAD值移栽后呈逐渐下降趋势，于幼穗分化期（栽后43或50 d）达到最低点，始穗期(60 DAT)后快速下降。不同组合以及同一组合在不同发育时期叶片SPAD值存在较大差异。灌浆结实期至蜡熟期，‘荣丰A’、‘五丰A’、‘华占’和‘广恢308’及其相应组合叶片SPAD值下降较快，而‘明恢63’和‘桂99’及其相应杂交组合依然保持相对较高的SPAD值，并与亲本SPAD值一般配合力的动态变化相一致。除分蘖始期叶片SPAD值以特殊配合力为主外，达70.76%，其余发育阶段叶片SPAD值均以一般配合力起主导作用。杂种叶片SPAD值在生殖生长阶段的遗传力(21.90%～63.89%)，显著高于其营养生长阶段的遗传力(8.02%～14.79%)；其遗传效应以加性效应为主，同时存在显性或/和上位性效应，始穗期至抽穗扬花期的显性或/和上位性效应增大，达18.37%和22.02%。发育前期和中期，叶片SPAD值受环境条件影响较小，后期则较大地受到环境条件影响。更多还原

【Abstract】 This study aims to reveal the dynamic changes in leaf SPAD values, and its general combining ability(GCA), genetic effects of South China late-season indica hybrid rice, in order to provide relevant scientific basis for the breeding of high efficient new hybrid varieties of South China. Three indica male sterile lines and six indica restorer lines widely used in South China were used to make 18 incomplete diallel cross combinations. Then, GCA and genetic effects of leaf SPAD values of these varieties at different developmental stages were analyzed. The results showed that the leaf SPAD values of hybrids and its parents showed a gradually decreasing trend after transplanting, reached the lowest point at the panicle initiation stage(43 or 50DAT), and rapidly decreased at the initial heading stage(60 DAT). There were significant differences in leaf SPAD values between different varieties and the same variety at different developmental stages. Especially,from the filling and fruiting stage to the wax ripening stage, the leaf SPAD values of‘Rongfeng A’,‘Wufeng A’,‘Huazhan’,‘Guanghui 308’and their corresponding hybrids decreased rapidly, while that of‘Minghui 63’,‘Gui99’and their corresponding hybrids still maintained relatively higher level, which displayed the same trend with the dynamic changes in GCA of their parents’ leaf SPAD values. Except for the early tilling stage in which the special combining ability(SCA) of the leaf SPAD value reached 70.76%, the GCA played a dominant role in the leaf SPAD value at all other developmental stages. The heritabilities of leaf SPAD value of hybrids in reproductive growth stage(21.90%-63.89%) were significantly higher than those in vegetative growth stage(8.02%-14.79%). The leaf SPAD value of hybrids was mainly attributed to additive effect, as well as dominant or/and epistatic effects at the same time. The dominant or/and epistatic effects increased from the initial heading stage to the flowering stage, reaching 18.37% and 22.02%, respectively. At the early and middle stages of development, the leaf SPAD value was less affected by environmental conditions, while at the later stage, it was more affected by environmental conditions.更多还原