The Effect of Leaf-cutting and Spikelet-thinning on the Starch RVA Profile Characteristics of the Japonica Rice‘Ningjing 1’and‘Zhendao 88’

doi:10.11924/j.issn.1000-6850.2013-3105

Abstract

Abstract: To determine the effects of dynamic changes of the Source-Sink on the RVA profile characteristics of starch, different leaf-cutting and spikelet-thinning treatments were conducted to investigate the relationship between Source-Sink and RAV properties. Japonica rice varieties‘Ningjing 1’and‘Zhendao 88’were used in this study. Leaf-cutting and spikelet-thinning treatments were conducted at the rice flowering stage in order to obtain the regulated leaf areas of single stem and differentiated numbers of spikelets per panicle. Effects of leaf- cutting and spikelet- thinning on the starch RVA profile characteristics were evaluated. The results indicated that as the number of the cut leaves increasing, the leaf-spikelet ratio decreased and Pkv, Hpv and cpv were significantly reduced. Furthermore, spikelet-thinning induces the increased leaf-spikelet ratio and the significant increases of Pkv, Hpv and cpv. Pkv, Hpv and cpv were changed rapidly within a certain range of the leaf-spikelet ratio (＜3.0 cm2/spikelet) and no significant changes were observed when the leaf-spikelet ratios were greater than 3.0 cm2/spikelet. Leaf-cutting and spikelet-thinning could significantly affect the RVA profile characteristics and 3.0 cm2/spikelet could be considered as the critical leaf- spikelet ratio that could affect the RVA profile characteristics. This result would provide a basis for breeding and cultivation of high-quality japonica rice.

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