Sistema vascular e controle do desenvolvimento de perfilhos em cereais de estação fria

Antônio Carlos Cardoso Alves,C. M. Mundstock,João De Deus Medeiros

Published 2000 in Brazilian Journal of Botany

ABSTRACT

Vascular system and tiller bud development control in small-grain cereals). The reasons for tiller absence and/or low survival were studied by analyzing vascular connections between the tiller and other plant parts. Experiments were conducted on open air and growth chamber conditions with wheat genotypes, IPF- 49865 (uniculm), EMBRAPA-16 and BR-23 (multiculm); oats, UFRGS-10 and UFRGS-15; and barley, FM-519. Analyses were made on main culm and primary tiller foliar development, number of primary and secondary tillers and vascularization and tiller vascular connection with the rest of the plants. Vascular connections did not explain tillering inhibition, since all tillers were vascularly connected to the plant. RESUMO - (Sistema vascular e controle do desenvolvimento de perfilhos em cereais de estacao fria). As causas da ausencia e/ou baixa sobrevivencia dos perfilhos foram estudadas pela conexao vascular entre os perfilhos e o resto da planta. Foram conduzidos ensaios em telado e câmara de crescimento com genotipos de trigo, IPF-49865 (unicolmo), EMBRAPA-16 e BR-23 (multicolmo), de aveia, UFRGS-10 e UFRGS-15 e de cevada, FM-519. Avaliaram-se o desenvolvimento foliar do colmo principal e dos perfilhos primarios, o numero de perfilhos primarios e secundarios, o numero de perfilhos ferteis e a vascularizacao e conexao vascular dos perfilhos com o resto da planta. A conexao vascular poderia explicar a inibicao dos perfilhos, pois todos estavam conectados vascularmente com o resto da planta.

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