A no hydrotropic response root mutant that responds positively to gravitropism in Arabidopsis

被引:84
作者
Eapen, D
Barroso, ML
Campos, ME
Ponce, G
Corkidi, G
Dubrovsky, JG
Cassab, GI
机构
[1] Univ Nacl Autonoma Mexico, Inst Biotechnol, Dept Biol Mol & Plantas, Cuernavaca 62250, Morelos, Mexico
[2] Univ Nacl Autonoma Mexico, Ctr Ciencias Aplicada & Desarrollo Tecnol, Lab Imagenes & Vis, Mexico City 04510, DF, Mexico
关键词
D O I
10.1104/pp.011841
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
For most plants survival depends upon the capacity of root tips to sense and move towards water and other nutrients in the soil. Because land plants cannot escape environmental stress they use developmental solutions to remodel themselves in order to better adapt to the new conditions. The primary site for perception of underground signals is the root cap (RC). Plant roots have positive hydrotropic response and modify their growth direction in search of water. Using a screening system with a water potential gradient, we isolated a no hydrotropic response (nhr) semi-dominant mutant of Arabidopsis that continued to grow downwardly into the medium with the lowest water potential contrary to the positive hydrotropic and negative gravitropic response seen in wild type-roots. The lack of hydrotropic response of nhr1 roots was confirmed in a system with a gradient in air moisture. The root gravitropic response of nhr1 seedlings was significantly faster in comparison with those of wild type. The frequency of the waving pattern in nhr1 roots was increased compared to those of wild type. nhr1 seedlings had abnormal root cap morphogenesis and reduced root growth sensitivity to abscisic acid (ABA) and the polar auxin transport inhibitor N-(1-naphtyl)phtalamic acid (NPA). These results showed that hydrotropism is amenable to genetic analysis and that an ABA signaling pathway participates in sensing water potential gradients through the root cap.
引用
收藏
页码:536 / 546
页数:11
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