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潜育性水稻田广泛分布于中国、斯里兰卡、印度、印度尼西亚、塞拉里昂、利比亚、尼日利亚、哥伦比亚和菲律宾等国 ,其中我国南方稻区就有近 70 0万公顷低产潜育性水稻田。该类水稻田还原性强 ,矿质营养失调 ,尤以Fe2 + 过量积累 ,对水稻生长发育产生不良的逆境胁迫作用。培育抗亚铁毒的水稻品种是简便、经济有效地提高稻谷产量的重要途径之一。该文利用由粳稻品种Asominori与籼稻品种IR2 4杂交衍生的Asominori染色体片段置换系(ChromosomeSegmentSubstitutionLines,CSSLs)群体为材料 ,检测与抗亚铁毒胁迫有关性状QTL。共检测到与抗亚铁毒胁迫有关性状QTL14个 ,各QTL的LOD值为 2 72～ 6 6 3。其中检测到与抗亚铁毒胁迫直接有关的性状叶片棕色斑点指数QTL 3个 ,分别位于第 3、9、11染色体C5 15～XNpb2 79、R2 6 38～C12 6 3和G14 6 5～C95 0之间 ,对应的贡献率分别为 16 4 5 %、11 16 %和 2 8 0 2 % ;与其他已发表的定位结果比较发现 ,位于第三染色体C5 15～XNpb2 79间控制叶片棕色斑点指数的QTL与水稻功能图谱上控制叶绿素含量的QTL的位置一致 ;表明在亚铁毒胁迫条件下 ,水稻在其叶片表面出现棕色斑点 ,叶片衰老 ,产生一些叶绿素降解物或衍生物 ,以提高叶片细胞对亚铁等重金属毒害的耐受力。另外 ,在?
Drought-bearing paddy fields are widely distributed in China, Sri Lanka, India, Indonesia, Sierra Leone, Libya, Nigeria, Colombia and the Philippines. Among them, there are nearly 7.0 million hectares of low-yielding and fertile paddy fields in southern China. This type of paddy rice is highly reductive and has a mineral nutrient imbalance, especially excessive accumulation of Fe2 +, which has adverse adverse stress effects on the growth and development of rice. Breeding anti-ferrous iron rice varieties is an easy, economical and effective way to improve rice production is one of the important ways. In this study, QTLs associated with resistance to ferrous iron stress were detected by using Asominori Chromosome Segment Substitution Lines (CSSLs) populations derived from cross between Indominori and indica variety IR2 4. A total of 14 QTLs were detected for resistance to ferrous stress, and the QTLs for LODs ranged from 726 to 663. Among them, 3 QTLs for brown spot index of leaf traits directly related to resistance to ferrous iron stress were found, located on chromosomes 3, 9, and 11 of chromosomes C5 15 to XNpb2 79, R2 6 38 to C12 6 3 and G14 6 5 to C95 0 The corresponding contribution rates were 16.45%, 11.16% and 28.02% respectively. Comparing with the published results of other published positions, it was found that the control index of brown spots on the third chromosome C515 ~ XNpb279 QTL was consistent with QTL controlling chlorophyll content on rice functional map. It showed that under the condition of ferrous stress, brown spots appeared on the leaves of rice and the leaves senesced, some chlorophyll degradation products or derivatives were produced to increase the number of leaf cell pairs Ferrous and other heavy metals poisoning tolerance. In addition, in?