Leaf plasticity in successive selection cycles of 'Saracura' maize in response to periodic soil flooding

Pesquisa Agropecuária Brasileira

Thiago Corrêa De Souza²  Paulo César Magalhães¹  Fabrício José Pereira²  Evaristo Mauro De Castro²  Jessé Marques Da Silva Junior²  Sidney Neto Parentoni¹ 

[1],Universidade Federal de Lavras Departamento de Biologia Setor de Fisiologia VegetalLavras MG ,Brazil

关键词: Zea mays;    hypoxia;    leaf anatomy;    tolerance to flooding;    Zea mays;    hipoxia;    anatomia foliar;    tolerância ao alagamento;   

DOI  :  10.1590/S0100-204X2010000100003

来源: SciELO

【 摘 要 】

The objective of this work was to assess the effect of successive selection cycles on leaf plasticity of 'Saracura' maize BRS-4154 under periodical flooding in field conditions. Soil flooding started at the six-leaf stage with the application of a 20-cm depth water layer three times a week. At flowering, samples of leaves were collected and fixed. Paradermic and transverse sections were observed under photonic microscope. Several changes were observed throughout the selection cycles, such as modifications in the number and size of the stomata, higher amount of vascular bundles and the resulting decrease of the distance between them, smaller diameter of the metaxylem, decrease of cuticle and epidermis thickness, decrease of number and size of bulliform cells, increase of phloem thickness, smaller sclerenchyma area. Therefore, the successive selection cycles of 'Saracura' maize resulted in changes in the leaf anatomy, which might be favorable to the plant's tolerance to the intermittent flooding of the soil.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License