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據(jù)英國(guó)每日郵報(bào)報(bào)道，日前，最新一項(xiàng)研究表明，甚至在1萬(wàn)年前的早期人類就掌握了“基因改良”水稻的種植技術(shù)。

該研究顯示遠(yuǎn)古人類可選擇不同的水稻株，然后將它們的基因混合在一起，形成理想產(chǎn)量的農(nóng)作物，這將形成較高的產(chǎn)量和易種植性。據(jù)悉，這項(xiàng)發(fā)現(xiàn)是科學(xué)家發(fā)現(xiàn)野生水稻基因中含有兩個(gè)截然不同的亞屬分支，受變異基因SD1的影響，水稻株的長(zhǎng)度被縮短。

日本神戶大學(xué)Masanori Yamasaki教授稱，這是近50年里現(xiàn)代水稻培育中最為重要的基因改良，然而我們竟發(fā)現(xiàn)1萬(wàn)年前的早期人類就早已掌握。目前，該項(xiàng)研究報(bào)告發(fā)表在《美國(guó)國(guó)家科學(xué)院學(xué)報(bào)》上。

隨著SD1基因的逐步進(jìn)化改良，水稻將形成更短、更結(jié)實(shí)的莖干，并生產(chǎn)更多的谷粒。研究人員發(fā)現(xiàn)現(xiàn)代培育水稻中混合了一個(gè)亞屬分支，這在野生水稻中并不存在。此外，相比之下培育亞屬分支水稻比野生水稻的SD1基因中，前者的遺傳多樣性較低。這表明在早期水稻培育中，SD1基因已經(jīng)過(guò)了人工選擇淘汰。

推薦原文出處：

Proceedings of the National Academy of Sciences    DOI：10.1073/pnas.1019490108

Artificial selection for a green revolution gene during japonica rice domestication

Kenji Asano, Masanori Yamasaki, Shohei Takuno, Kotaro Miura, Satoshi Katagiri, Tomoko Ito, Kazuyuki Doi, Jianzhong Wu, Kaworu Ebana, Takashi Matsumoto, Hideki Innan, Hidemi Kitano, Motoyuki Ashikari, and Makoto Matsuoka

The semidwarf phenotype has been extensively selected during modern crop breeding as an agronomically important trait. Introduction of the semidwarf gene, semi-dwarf1 (sd1), which encodes a gibberellin biosynthesis enzyme, made significant contributions to the “green revolution” in rice (Oryza sativa L.). Here we report that SD1 was involved not only in modern breeding including the green revolution, but also in early steps of rice domestication. We identified two SNPs in O. sativa subspecies (ssp.) japonica SD1 as functional nucleotide polymorphisms (FNPs) responsible for shorter culm length and low gibberellin biosynthetic activity. Genetic diversity analysis among O. sativa ssp. japonica and indica, along with their wild ancestor O. rufipogon Griff, revealed that these FNPs clearly differentiate the japonica landrace and O. rufipogon. We also found a dramatic reduction in nucleotide diversity around SD1 only in the japonica landrace, not in the indica landrace or O. rufipogon. These findings indicate that SD1 has been subjected to artificial selection in rice evolution and that the FNPs participated in japonica domestication, suggesting that ancient humans already used the green revolution gene.

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