The remodeling of root architecture is a major developmental response of plants to phosphate （Pi） deficiency and is thought to enhance a plant＇s ability to forage for the available Pi in topsoil. The underlying mec...The remodeling of root architecture is a major developmental response of plants to phosphate （Pi） deficiency and is thought to enhance a plant＇s ability to forage for the available Pi in topsoil. The underlying mechanism controlling this response, however, is poorly understood. In this study, we identified an Arabidopsis mutant, hps 10 （hypersensitive to Pi starvation 10）, which is morphologically normal under Pi sufficient condition but shows increased inhibition of primary root growth and enhanced production of lateral roots under Pi defi- ciency, hpslO is a previously identified allele （als3-3） of the ALUMINUM SENSITIVE3 （ALS3） gene, which is involved in plant tolerance to aluminum toxicity. Our results show that ALS3 and its interacting protein AtSTAR1 form an ABC transporter complex in the tonoplast. This protein complex mediates a highly electro- genic transport in Xenopus oocytes. Under Pi deficiency, als3 accumulates higher levels of Fe3＋ in its roots than the wild type does. In Arabidopsis, LPR1 （LOW PHOSPHATE ROOT1） and LPR2 encode ferroxidases, which when mutated, reduce Fe3＋ accumulation in roots and cause root growth to be insensitive to Pi defi- ciency. Here, we provide compelling evidence showing that ALS3 cooperates with LPR1/2 to regulate Pi deficiency-induced remodeling of root architecture by modulating Fe homeostasis in roots.展开更多
对新疆低温煤焦油抽提得到的酸性组分、碱性组分、中性组分及柱分离中性组分得到的不同极性组分进行1 H NMR和13 C NMR表征,同时利用无畸变极化转移增益法对不同类型的碳进行了归属。结果表明,新疆低温煤焦油是一种结构复杂的化合物,其...对新疆低温煤焦油抽提得到的酸性组分、碱性组分、中性组分及柱分离中性组分得到的不同极性组分进行1 H NMR和13 C NMR表征,同时利用无畸变极化转移增益法对不同类型的碳进行了归属。结果表明,新疆低温煤焦油是一种结构复杂的化合物,其中含有大量的亚甲基碳、次甲基碳等油潜力碳,可加工成汽油、柴油等高附加值的燃料油;酸性组分中含有大量的酚基,可提取酚类化工原料;中性组分以多烷基芳烃化合物为主,可用于生产芳烃等有机化合物。低温煤焦油是一种有价值的化工原料,同时,高分辨NMR为低温煤焦油的结构研究提供了一种可靠的表征手段,具有一定的研究意义。展开更多
文摘The remodeling of root architecture is a major developmental response of plants to phosphate （Pi） deficiency and is thought to enhance a plant＇s ability to forage for the available Pi in topsoil. The underlying mechanism controlling this response, however, is poorly understood. In this study, we identified an Arabidopsis mutant, hps 10 （hypersensitive to Pi starvation 10）, which is morphologically normal under Pi sufficient condition but shows increased inhibition of primary root growth and enhanced production of lateral roots under Pi defi- ciency, hpslO is a previously identified allele （als3-3） of the ALUMINUM SENSITIVE3 （ALS3） gene, which is involved in plant tolerance to aluminum toxicity. Our results show that ALS3 and its interacting protein AtSTAR1 form an ABC transporter complex in the tonoplast. This protein complex mediates a highly electro- genic transport in Xenopus oocytes. Under Pi deficiency, als3 accumulates higher levels of Fe3＋ in its roots than the wild type does. In Arabidopsis, LPR1 （LOW PHOSPHATE ROOT1） and LPR2 encode ferroxidases, which when mutated, reduce Fe3＋ accumulation in roots and cause root growth to be insensitive to Pi defi- ciency. Here, we provide compelling evidence showing that ALS3 cooperates with LPR1/2 to regulate Pi deficiency-induced remodeling of root architecture by modulating Fe homeostasis in roots.
文摘对新疆低温煤焦油抽提得到的酸性组分、碱性组分、中性组分及柱分离中性组分得到的不同极性组分进行1 H NMR和13 C NMR表征,同时利用无畸变极化转移增益法对不同类型的碳进行了归属。结果表明,新疆低温煤焦油是一种结构复杂的化合物,其中含有大量的亚甲基碳、次甲基碳等油潜力碳,可加工成汽油、柴油等高附加值的燃料油;酸性组分中含有大量的酚基,可提取酚类化工原料;中性组分以多烷基芳烃化合物为主,可用于生产芳烃等有机化合物。低温煤焦油是一种有价值的化工原料,同时,高分辨NMR为低温煤焦油的结构研究提供了一种可靠的表征手段,具有一定的研究意义。
