Involvement of ABA in reduced photosynthesis and stomatal conductance in Cuscuta campestris - Mikania micrantha association

H. Chen; H. Shen; W. Ye; H. Cao; Z. Wang

Involvement of ABA in reduced photosynthesis and stomatal conductance in Cuscuta campestris - Mikania micrantha association

2011

H. Chen | H. Shen | W. Ye | H. Cao | Z. Wang

We investigated whether changes in abscisic acid (ABA) content in leaves of Mikania micrantha infected by the holoparasite Cuscuta campestris at five growth stages, influenced the host stomatal conductance (gs), transpiration rate (E) and net photosynthetic rate (PN). C. campestris infection caused a negative effect on gs, E and PN of the host plants. ABA content in host leaves infected by C. campestris was significantly lower at 6 d after parasitization (DAP) and significantly higher at 13 and 33 DAP, relative to uninfected controls. In the parasite, ABA content was lowest at 13 DAP and then sharply increased to the maximum at 26 DAP. Moreover, the ABA content in the parasite was always lower than in the infected host leaves. The results suggest that an increase in host ABA concentration contributes to reduced host gs, E and PN in the holoparasitic C. campestris - M. micrantha association.

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