Responses of six Brachiaria spp. accessions to root zone flooding

Revista Brasileira de Zootecnia

Luana Pabla De Souza Caetano²  Moacyr Bernardino Dias-filho¹ 

[1] ,Museu Paraense Emilio GoeldiBelém PA ,Brazil

关键词: biomass allocation;    Brachiaria brizantha;    leaf elongation rate;    photosynthesis;    relative growth rate;    alocação de biomassa;    alongamento foliar;    Brachiaria brizantha;    fotossíntese;    taxa de crescimento relativo;   

DOI  :  10.1590/S1516-35982008000500003

来源: SciELO

【 摘 要 】

Some morphophysiological responses of Brachiaria brizantha cv. Marandu, cv. Piatã, cv. Arapoty, B163, B166 and B. ruziziensis R124 were compared in plants grown in pots, under flooded and well-drained conditions. Flooding reduced leaf elongation rate in all accessions. Leaf dry mass production was lower under flooding than in the control plants in all the studied accessions, except in cv. Piatã. Root dry mass production was reduced by flooding in cv. Marandu and in R124, while the proportion of biomass allocated to roots was reduced by flooding only in R124. It was not possible to detect significant differences between water regimes in the percentage of biomass allocated to culms and leaves for all accessions. Flooding decreased the number of tillers in cv. Marandu, in B163, B166 and in R124. Relative growth rate was decreased by flooding in cv. Marandu, in B163 and in R124. Flooding reduced gas exchange parameters in all accessions, but cv. Arapoty. The accessions tested differ in their relative tolerance to flooding. B. brizantha cv. Arapoty is considered the most tolerant. B. ruziziensis R124 is the most sensitive, followed by B. brizantha cv. Marandu. B. brizantha cv. Piatã, B163 and B166 are intermediate in flooding tolerance.

【 授权许可】

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