A no hydrotropic responseRoot Mutant that Responds Positively to Gravitropism in Arabidopsis1,

Author:

Eapen Delfeena1,Barroso Marı́a Luisa1,Campos Marı́a Eugenia1,Ponce Georgina1,Corkidi Gabriel2,Dubrovsky Joseph G.1,Cassab Gladys I.1

Affiliation:

1. Departamento de Biologı́a Molecular de Plantas, Instituto de Biotecnologı́a, Universidad Nacional Autónoma de México, Apartado Postal 510–3, Cuernavaca, Morelos, 62250 Mexico (D.E., M.L.B., M.E.C., G.P., J.G.D., G.I.C.); and

2. Laboratorio de Imágenes y Visión, Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México, México, D.F., 04510 Mexico (G.C.)

Abstract

Abstract 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 ano 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 nhr1roots 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.

Publisher

Oxford University Press (OUP)

Subject

Plant Science,Genetics,Physiology

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