Functional analysis of the lodging resistance QTL BSUC11 on morphological and chemical characteristics in upper culms of rice
Functional analysis of the lodging resistance QTL BSUC11 on morphological and chemical characteristics in upper culms of rice
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DOI：
10.1007/s10681-016-1707-1
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发表时间：
2016-07-01
期刊：
影响因子：
1.9
通讯作者：
Ishimaru, Ken
中科院分区：
文献类型：
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作者：
Kashiwagi, Takayuki;Munakata, Jun;Ishimaru, Ken
水稻灌浆至完全成熟期秆力退化是水稻倒伏的主要原因之一。抗弯型倒伏的数量性状基因座BSUC 11能防止上部秆的物理强度下降。茎秆的物理强度由形态特征和化学成分决定。为明确水稻灌浆后茎秆强度退化的关键因素，利用BSUC 11的染色体片段代换系（CSSLs）对上部茎秆的形态性状和化学成分进行了功能分析。抽穗后4 ~ 6周，BSUC 11的CSSLs上部秆干重均大于越光。在形态特征上，BSUC 11的CSSLs仅表现出节间I皮层纤维组织增厚，上部秆的直径和壁厚没有增加。此外，与“越彦”相比，BSUC 11的CSSLs的上部秆增加了综纤维素含量，而不是木质素、非结构性碳水化合物或矿物质。这些结果表明，水稻灌浆后秆力的劣化主要是由综纤维素含量引起的，而不是由形态性状引起的，BSUC 11可以通过抑制综纤维素含量的劣化来提高水稻的抗倒伏能力。
Culm strength deterioration from grain filling to the fully ripe stage is one of the main causes of rice lodging. The quantitative trait locus for resistance to bending-type lodging, BSUC11, prevents upper culms from deteriorating their physical strength. The physical strength of culms is determined by morphological traits and chemical components. To clarify key factors preventing strength deterioration of culms after grain filling, this study conducted functional analyses on morphological traits and chemical components of upper culms using chromosomal segment substitution lines (CSSLs) containing BSUC11. Dry weights of upper culms in CSSLs with BSUC11 were heavier than those of 'Koshihikari' from 4 to 6 weeks after heading. For morphological traits at the fully ripe stage, CSSLs with BSUC11 only showed a thickening of cortical fiber tissues in internode I, and did not have greater diameter or wall thicknesses of upper culms. Additionally, the upper culms of CSSLs with BSUC11 increased holocellulose content instead of lignin, nonstructural carbohydrates, or minerals compared with 'Koshihikari'. These results suggest that culm strength deterioration after grain filling is contributed to by holocellulose content rather than morphological traits in rice culms, and BSUC11 could improve lodging resistance through prevention of this deterioration factor.