Effects of antitranspirants on water relations and photosynthetic rate of cultivated tropical plant (Polianthes tuberosa L.)

• Autorzy: Moftah A. , Al-Humaid A.
• Języki publikacji: EN

Abstrakty

EN

The effects of pinolene-base Vapor Gard (VG) emulsion type film and Kaolin, Surround (WP) particle type film antitranspirants on stomatal behavior, water status, carbon assimilation and transpiration rate of tuberose (Polianthes tuberosa L.) were stubied. The plants grown under the irrigation regimes of 100, 80 and 60% of total evapotranspiration (ET) values were investigated to select the most suitable antitranspirant for conserving irrigation water, used in cultivation of tuberose plants in arid regions. Severe water stress, decreased the stomatal frequency and conductance (g_s), the leaf water potential (Ψ_w), the osmotic potential (Ψ_π) and the turgor potential (Ψ_p), the relative water content (RWC), the chlorophyll content (chl), the carbon assimilation rate (A) and the transpiration rate (E). Both types of antitranspirants effectively enhanced the performance and physiological activities of water-stressed plants particularly at the 80% ET, but they did not compensate for the negative effects caused by the 60% ET treatment. However, the particle type, Kaolin, was more effective than the emulsion type, VG, due to its ability to reduce leaf temperature. The increased g_s caused by VG and Kaolin sprays were accompanied by increased A suggesting that g_s might have a limiting effect on A in water-stressed plants. Water use efficiency (WUE) of Kaolin-sprayed leaves was significantly higher than that of VG sprayed leaves. However, no significant differences between both antitranspirants on E were recorded. Increased WUE, therefore, could be attributed to a higher A by using Kaolin as compared with VG sprays. Thus, particle type antitranspirants are more effective in regulating water status, WUE and the photosynthetic activity of tuberose plants in arid regions.

Słowa kluczowe

EN

antitranspirant; photosynthesis; Polianthes; water relations; water stress

• Wydawca: Museum and Institute of Zoology, Polish Academy of Sciences
• Czasopismo: Polish Journal of Ecology
• Rocznik: 2005
• Tom: Vol. 53, nr 2
• Strony: 165--175
• Opis fizyczny: Bibliogr. 27 poz., tab., wykr.

Twórcy

autor

Moftah A.

• College of Agriculture and Veterinary Medicine Qassim University, P.O. Box: 1482 Buridah, Saudi Arabia

autor

Al-Humaid A.

• College of Agriculture and Veterinary Medicine Qassim University, P.O. Box: 1482 Buridah, Saudi Arabia

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