Improvement of lodging resistance with QTLs for stem diameter in rice (Oryza sativa L.)
Improvement of lodging resistance with QTLs for stem diameter in rice (Oryza sativa L.)
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DOI：
10.1007/s00122-008-0816-1
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发表时间：
2008-09-01
影响因子：
5.4
通讯作者：
Ishimaru, Ken
中科院分区：
文献类型：
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作者：
Kashiwagi, Takayuki;Togawa, Eiji;Ishimaru, Ken
10个水稻品种间的品种差异表明，茎粗是抗倒性的关键因素。从品种Nipponbar和Kasalath之间的一系列染色体片段代换系中筛选出2个近等基因系（NILs），其中一个含有1个茎粗QTL（sdm 8; NIL 114），另一个含有4个茎粗QTL（sdm 1，sdm 7，sdm 8，sdm 12; NIL 28）。与Nipponbare对照相比，NIL 114和NIL 28的茎直径分别增大约7%和39%。NIL 28的抗推性显著大于Nipponbare，但NIL 114与Nipponbare相似。两个近等基因系的下茎重和茎壁厚均大于日本晴。NIL 28的株高比日本晴高，这对抗倒伏性有负面影响。近等基因系茎中非结构性碳水化合物含量高于日本晴，硅含量低于日本晴，纤维素含量仅低于日本晴28。两个近等基因系的基部节间比日本晴的基部节间硬。这些结果表明，在水稻育种中增加茎粗可以提高抗倒性，但多个QTL的组合也可以提高植株的株高，而多个QTL的组合也可以提高植株的株高。
Varietal differences among ten rice cultivars showed that stem diameter is a key factor in lodging resistance (measured in terms of pushing resistance). Two near-isogenic lines (NILs) were selected from a series of chromosome segment substitution lines developed between cultivars Nipponbar and Kasalath, one containing a single stem diameter QTL (sdm8; NIL114), and another with four stem diameter QTLs (sdm1, sdm7, sdm8, sdm12; NIL28). Compared with the Nipponbare control, stem diameters were larger in NIL114 and NIL28 by about 7 and 39%, respectively. Pushing resistance in NIL28 was significantly greater than in Nipponbare, but NIL114 was similar to Nipponbare. The two NILs had greater weight of lower stem and culm wall thickness than Nipponbare. NIL28 had higher plant height, which is a negative effect on lodging resistance, than Nipponbare. The non-structural carbohydrate contents of NIL stems were higher than that of Nipponbare, whereas the silicon contents were lower in the NILs, and cellulose contents were lower only in NIL28. The basal internodes of the two NILs were significantly stiffer than those of Nipponbare. These results suggest that increasing stem diameter in rice breeding programs would improve lodging resistance, although the combination of multiple QTLs would be necessary to produce thicker stems with higher pushing resistance, whereas the higher plant height could also result from the combination of multiple QTLs.