Evaluation of Elephant grass clones (Pennisetum purpureum Schum.) and Elephant grass x pearl millet (Pennisetum glaucum (L.) R. Br.) hybrid submitted to water stress. 1. Morphological parameters

Barreto, G.P.; Lira, M. de A.; Santos, M.V.F. dos; Dubeux, J.J.C.B.

Revista Brasileira de Zootecnia 30(1): 1-6

2001


ISSN/ISBN: 1516-3598
Accession: 003437500

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Abstract
This trial was carried out in Pernambuco, Brazil to evaluate the morphological characteristics of three elephant grass clones (Cameroon, Roxo de Botucatu and Mott) and an elephant grass x pearl millet hybrid (HV-241) submitted to 2 humidity regimes (with and without water stress). Plants submitted to water stress had lower height, and none of them showed internodes above cutting height (10 cm). As a result of water stress, plant height reductions were 42.7, 35.05, 28.54 and 27.43% for Cameroon, Roxo de Botucatu, HV-241 and Mott, respectively. Leaf blade length was reduced from 69.9 cm in the wet treatment to 50.0 cm in those submitted to water stress, whereas leaf blade width average of water stress plants was less than half of that in wet treatments. Water stress did not affect the tillering of cultivars, but in HV-241 hybrid, it reduced both the number of lateral tillers per plant and total number of tillers per plant. In both humidity regimes, hybrid HV-241 showed maximum tillering. It was observed that, except for tillering of cultivars, water stress promoted a reduction in most of the morphological parameters studied.