【水稻株高调控研究获重大进展】Liguo Zhang Zhijun Cheng Ruizhen Qin Yang Qiu Jiu-Lin Wang Xiekui Cui Lianfeng Gu Xin Zhang Xiuping Guo Dan Wang Ling Jiang Chuan-yin Wu Haiyang Wang Xiaofeng Cao and Jianmin Wan. Identification and Characterization of an Epi-Allele of FIE1 Reveals a Regulatory Linkage between Two Epigenetic Marks in Rice. the Plant Cell 2012 doi: http:-​-​dx.​doi.​org-​10.​1105-​tpc.​112.​102269.

如果稻农撒下一片种子，最后发现水稻光“长个”、不抽穗，那一季的辛苦就要白费。所以，弄 清楚水稻株高的发育受哪些因素的影响，对粮食生产特别重要。记者今天获悉，我国科学家对此的研究有了重大进展：中国农科院作物研究所万建民课题组最近发现 了“表观遗传修饰”对水稻株高和花器官发育所起重要作用的原理。有关研究结果近日被国际知名刊物《植物细胞（The Plant Cell）》接收。
 
据介绍，籼种水稻和粳种水稻亚种间杂种优势强大，一般比亚种内杂交水稻产量潜力高 10%-30%，但籼粳亚种间杂种存在半不育、超亲晚熟和株高超亲等问题，突出表现就是水稻株偏高，严重影响其在粮食生产上的应用。万建民课题组致力于解 决水稻籼粳亚种间杂种优势利用中遇到的障碍。科研人员说，此次他们通过表观遗传调控研究，发现了1个显性矮秆突变体Epi-df，其具有较强的降秆能力， 从而揭示了DNA甲基化和组蛋白修饰之间的关联，这就为进一步研究“表观遗传修饰”对水稻生长发育的调控机制奠定了基础，有望在将来的水稻籼粳杂种优势利 用中，用来解决水稻株高偏高的问题。（来源：光明日报）

Abstract

The evolutionary importance of meiosis may not solely be associated with allelic shuffling caused by crossing-over but also have to do with its more immediate effects such as gene conversion. Although estimates of the crossing-over rate are often well resolved the gene conversion rate is much less clear. In Arabidopsis for example next-generation sequencing approaches suggest that the two rates are about the same which contrasts with i

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