Loss of an MDR transporter in compact stalks of maize br2 and sorghum dw3 mutants
Loss of an MDR transporter in compact stalks of maize br2 and sorghum dw3 mutants
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DOI：
10.1126/science.1086072
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发表时间：
2003-10-03
期刊：
影响因子：
56.9
通讯作者：
Johal, GS
中科院分区：
文献类型：
--
作者：
Multani, DS;Briggs, SP;Johal, GS
对农业有利的植株高度的降低通常是通过阻止赤霉素的作用或产生来实现的。在这里，我们描述了在玉米brachytic2(BR2)突变体中发现的一种不同的矮化机制，其特征是紧凑的下部茎间。这些植物的身高降低是由于玉米秸秆中调节生长素极性运输的一种P-糖蛋白的丢失。BR2的高粱直系是Dwarf3(Dw3)，这是一个长期存在商业利益和关注的不稳定突变体。Dw3基因内的直接复制是其突变性和不稳定性的原因，因为它促进了基因座上的不平等交换。
Agriculturally advantageous reduction in plant height is usually achieved by blocking the action or production of gibberellins. Here, we describe a different dwarfing mechanism found in maize brachytic2 (br2) mutants characterized by compact lower stalk internodes. The height reduction in these plants results from the loss of a P-glycoprotein that modulates polar auxin transport in the maize stalk. The sorghum ortholog of br2 is dwarf3 (dw3), an unstable mutant of long-standing commercial interest and concern. A direct duplication within the dw3 gene is responsible for its mutant nature and also for its instability, because it facilitates unequal crossing-over at the locus.