Portal de Periódicos da CAPES

Artigo Produção Nacional Revisado por pares

BIBTEX RIS

Effects of drought stress on chlorophyll a fluorescence in two rubber tree clones

2017; Elsevier BV; Volume: 224; Linguagem: Inglês

10.1016/j.scienta.2017.06.019

1879-1018

Antelmo Ralph Falqueto, Roque Alves da Silva Júnior, Marcos Thiago Gaudio Gomes, João Paulo Rodrigues Martins, Diolina Moura Silva, Fábio Luiz Partelli,

Plant biochemistry and biosynthesis

This study compared the photosynthetic responses of two clones (RRIM600 and FX3864) of the rubber tree (Hevea brasiliensis L.) subjected to drought stress. This stress was imposed by complete removal of watering until the leaf water potential (Ψw) reached critical values, which occurred at 38 days after water deficit (DAWD) for both rubber clones. One-year-old rubber plants were cultivated in 20 L pots filled with a soil:sand:humus ratio of 4:3:3. Photosynthetic performance was analyzed by measuring chlorophyll a fluorescence transients at 0, 28, 36, and 38 DAWD. The photochemical process was altered to some extent following water deficit. A decrease in Ψw was observed for both rubber clones at 36 DAWD. The FX3864 clone was more susceptible to drought and showed a deficiency in photosynthetic electron transport. The RRIM600 rubber clone showed an advantage over the FX3864 clone in terms of stability and efficiency in utilizing energy in low rainfall sites.