为了探明生育前期动态密度稀化下不同产量双季晚稻品种群体自动调节力的差异及其生理机制，以五丰优T025和昌优10号为材料，于分蘖期进行递次间蔸密度稀化处理，分析了产量及其构成、干物质量（DMW）、比叶重（SLA）、叶面积指数（LAI）及倒2叶内源激素含量等。结果表明，间蔸稀化处理后两个品种单位面积产量表现出不同程度下降，单株产量、单株有效穗数、每穗粒数、结实率和千粒重则不同程度上升，同一密度下五丰优T025单位面积产量均高于昌优10号，变异系数和极差则低于后者；五丰优T025群体自动调节力明显强于昌优10号；五丰优T025间蔸稀化处理下单株产量较对照（不间蔸）上升的幅度大于昌优10号，且其极差率更大；前者个体对群体的补偿力强于后者，主要是其单株有效穗数优势明显；五丰优T025个体通过增强分蘖数、增加单株干物质积累、减缓抽穗至成熟期叶面积指数和比叶重的下降速率来弥补群体单位面积有效穗数及干物质积累下降的能力强于昌优10号；间蔸稀化处理减缓了两个品种抽穗后倒2叶生长抑制类激素ABA含量的上升及生长促进类激素ZR、IAA和 GA3含量的下降速率，且总体上五丰优T025该能力强于昌优10号。
陈小荣*,肖自京,孙嘉,钟蕾,朱昌兰,彭小松,贺晓鹏,傅军如,欧阳,林娟,贺浩华
. 不同产量晚稻品种分蘖期动态密度稀化下群体自动调节力的差异与生理机制[J]. 中国水稻科学, 2013
, 27(4)
: 405
-412
.
DOI: 10.3969/j.issn.1001-7216.2013.04.010
In order to reveal the discrepancy of the population self regulatory ability for the doubleseason late rice varieties with different yields and its physiological mechanism of thinning of seedlings in early growth stage, yield and its components, dry matter weight (DMW), special leaf area (SLA), leaf area index (LAI) and endogenous hormones contents in reciprocal second leaf were investigated with Wufengyou T025 and Changyou 10 as material under the treatment of successive thinning of seedlings during tillering stage. The results showed that yield per unit area of the two varieties declined to various extents under the treatment of successive thinning of seedlings, while yield per plant, effective panicle number per plant, grains per panicle, seedsetting rate and 1000grain weight all increased to various extent. Yield per unit area of Wufengyou T025 was higher than that of Changyou 10 under the same density, while its variation coefficient and range rate were lower than the latter, demonstrating stronger population selfregulatory ability of Wufengyou T025. Comparing to the control, the incremental extent of the mean value for the yield per plant of Wufengyou T025 under successive thinning of seedlings were higher than Changyou 10, moreover, its range rate was greater, indicating its stronger individual compensatory ability for the population, which was mainly attributed to its more clearly superiority in the effective panicle number per plant. The ability of offsetting the decrease of effective panicle number per unit area and population dry matter accumulation per unit area by increasing tillers per plant, dry matter accumulation per plant, as well as reducing the decrease rate of LAI and SLW from heading to maturing for Wufengyou T025 was stronger than that for Changyou 10. Successive thinning of seedlings would slow up the rise of growth inhibited hormone abscisic acid (ABA) and the drop speed of growth promoted hormones zeatin riboside (ZR), indole3acetic acid (IAA) and gibberellin A3 (GA3) after heading in the reciprocal second leaf of the two varieties, while the ability of the Wufengyou T025 was stronger than that of Changyou 10 as a whole.
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