Respostas fisiológicas de plantas jovens de macaúba a condições de seca cíclica

Clenilso Sehnen Mota; Marco Antonio Oliva Cano

doi:10.4336/2016.pfb.36.87.1061

Authors

Clenilso Sehnen Mota Instituto Federal Catarinense
Marco Antonio Oliva Cano Universidade Federal de Viçosa

DOI:

https://doi.org/10.4336/2016.pfb.36.87.1061

Keywords:

Acrocomia aculeata, Energy balance, Osmolytes

Abstract

The objective of this study was to evaluate the impact of three cycles of drought/irrigation on the quantum yields of chlorophyll a fluorescence, proline accumulation and osmotic adjustment. Ten plants were submitted to three consecutive cycles of drought/irrigation (D/I) and the other ten were maintained at field capacity.Cycles D/I did not promote osmotic adjustment in plants with suspension of irrigation (WSI), despite the proline accumulation. The minimum fluorescence adapted to dark increased and the maximum quantum efficiency of PSII was reduced in WSI plants. Quantum yield of photochemical energy conversion of photosystem II (PSII) and the apparent rate of electron transport decreased, while quantum yield dissipation regulated non-photochemical energy in PSII showed an increase in WSI plants over those without suspension of irrigation (WOSI). Quantum yield of no regulated dissipation of PSII non-photochemical energy and chlorophyll and carotenoid content showed no change between WSI and WOSI plants over D/I cycles. Thus it was observed that macaubeira presents an efficient mechanism of non-photochemical energy dissipation.

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Author Biographies

Clenilso Sehnen Mota, Instituto Federal Catarinense

http://lattes.cnpq.br/0131884660611016

Marco Antonio Oliva Cano, Universidade Federal de Viçosa

http://lattes.cnpq.br/1921876952734260

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