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An experiment was conducted to examine the response of Hibiscus plants (Hibiscus rosa-simensis L.) to short-term change in air humidity. Photosynthetic capacity and quantum yield descreased when vapor... pressure difference (VPD) of leaf to air increased from 0.8 to 1.5kPa. Photosynthetic depression by high VPD was attributed to decreases in both leaf (g_L) and mesophyll (g_M) conductances. Under a high VPD as 2.5kPa, net photosynthesis (P_N) showed oscillations with time. The amplitude of the cycle was decreased and the oscillation period was extended when the attached leaf was exposed to a lower light. The corresponding oscillation in g_L suggested that oscillation in P_N of Hibiscus in dry air was caused by the cyclic movement of stomata. The integrated results showed that hibiscus plants are sensitive to low air humidity.続きを見る
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Mendeley出力
KJ00004506860