Sensitivity of yellow passion fruit to ultraviolet-B radiation

Pesquisa Agropecuária Brasileira

Inês Cechin¹  Valéria De Jesus Rocha¹  Terezinha De Fátima Fumis¹ 

[1],Universidade do Estado de São Paulo Faculdade de Ciências Departamento de Ciências BiológicasBauru SP ,Brazil

关键词: Passiflora edulis;    anthocyanins;    growth;    phenolic compounds;    photosynthesis;    Passiflora edulis;    antocianinas;    crescimento;    compostos fenólicos;    fotossíntese;   

DOI  :  10.1590/S0100-204X2012001000002

来源: SciELO

【 摘 要 】

The objective of this work was to evaluate the effects of UV-B radiation on the vegetative growth and on the gas exchange characteristics of passion fruit plants (Passiflora edulis) grown in greenhouse. The average unweighted UV-B radiation near the apex of the plants was 8 W m-2 for the UV-B treatment (high UV-B), and 0.8 W m-2 for the control plants (low UV-B). Plants were irradiated with UV-B for 7 hours per day, centered on solar noon, during 16 days. High UV-B radiation resulted in lower shoot dry matter accumulation per plant. The content of UV-B absorbing compounds and anthocyanins was increased in the plants exposed to high UV-B radiation, when compared with the control. UV-B radiation did not affect stomatal conductance or transpiration rate, but reduced photosynthesis and instantaneous water-use efficiency, and increased intercellular CO2 concentration. The accumulation of UV-B-absorbing compounds and anthocyanins did not effectively shield plants from supplementary UV-B radiation, since the growth and photosynthetic processes were significantly reduced.

【 授权许可】

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