一個(gè)國(guó)際研究小組發(fā)現(xiàn)了一種蛋白質(zhì),，它能調(diào)節(jié)植物吸入二氧化碳和蒸發(fā)水分,，這一發(fā)現(xiàn)將可能為培植抗旱作物提供新方法,。
據(jù)最新一期《自然》雜志報(bào)道，芬蘭和美國(guó)的聯(lián)合研究小組發(fā)現(xiàn),，一種名為ＳＬＡＣ１的質(zhì)膜蛋白質(zhì)在植物氣孔的開閉過程中起關(guān)鍵作用,。研究人員說，這
一發(fā)現(xiàn)可使他們對(duì)植物進(jìn)行改良,，使植物在不斷吸入二氧化碳的同時(shí)減少向大氣中蒸發(fā)水分,，這樣植物便能在極其干旱的環(huán)境中成長(zhǎng)。
研究人員說,，他們已經(jīng)對(duì)多種水芹進(jìn)行了改良實(shí)驗(yàn),。
生物谷推薦原始出處：
Nature advance online publication 27 February 2008 | doi:10.1038/nature06720; Received 22 August 2007; Accepted 14 January 2008; Published online 27 February 2008
CO2 regulator SLAC1 and its homologues are essential for anion homeostasis in plant cells
Juntaro Negi, Osamu Matsuda, Takashi Nagasawa, Yasuhiro Oba, Hideyuki Takahashi, Maki Kawai-Yamada, Hirofumi Uchimiya, Mimi Hashimoto & Koh Iba
The continuing rise in atmospheric [CO2] is predicted to have diverse and dramatic effects on the productivity of agriculture, plant ecosystems and gas exchange1, 2, 3. Stomatal pores in the epidermis provide gates for the exchange of CO2 and water between plants and the atmosphere, processes vital to plant life4, 5, 6. Increased [CO2] has been shown to enhance anion channel activity7 proposed to mediate efflux of osmoregulatory anions (Cl– and malate2–) from guard cells during stomatal closure8, 9. However, the genes encoding anion efflux channels in plant plasma membranes remain unknown. Here we report the isolation of an Arabidopsis gene, SLAC1 (SLOW ANION CHANNEL-ASSOCIATED 1, At1g12480), which mediates CO2 sensitivity in regulation of plant gas exchange. The SLAC1 protein is a distant homologue of bacterial and fungal C4-dicarboxylate transporters, and is localized specifically to the plasma membrane of guard cells. It belongs to a protein family that in Arabidopsis consists of four structurally related members that are common in their plasma membrane localization, but show distinct tissue-specific expression patterns. The loss-of-function mutation in SLAC1 was accompanied by an over-accumulation of the osmoregulatory anions in guard cell protoplasts. Guard-cell-specific expression of SLAC1 or its family members resulted in restoration of the wild-type stomatal responses, including CO2 sensitivity, and also in the dissipation of the over-accumulated anions. These results suggest that SLAC1-family proteins have an evolutionarily conserved function that is required for the maintenance of organic/inorganic anion homeostasis on the cellular level.
