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首页> 外文期刊>园芸学会杂志 >Effects of Light Intensity and Temperature on Growth, Flowering, and Single- leaf CO_2 Assimilation in Odontioda Orchid
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Effects of Light Intensity and Temperature on Growth, Flowering, and Single- leaf CO_2 Assimilation in Odontioda Orchid

机译：光强和温度对尾牙兰生长，开花和单叶CO_2同化的影响

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摘要

We investigated the effects of light intensity and temperature on growth, flowering, and single -leaf CO2 assimilation of Odontioda orchid. CO2 assimilation in final leaves of back and current shoots was depressed significantly at a leaf temperature of about 30°C, in association with decreased stomatal conductance, although the light saturation point differed somewhat between back shoots and current shoots. A photosynthetic photon flux density (PPFD) of about 400 μmol·m~(-2)·s~(-1) was optimum for CO2 assimilation. Large quantities of sugar and starch were reserved in pseudobulbs of back shoots under high light intensity, but they contents decreased while the current shoot was developing new leaves. When growth stopped, the amount of reserve assimilates increased again. Thus, there appears to be a dynamic translocation of assimilates between the pseudobulbs of back shoots and current shoots. All plants cultivated under a 28/18°C (dayight) died within 2 months after the beginning of the experiment confirmed that this species has low heat tolerance. Growth and flowering were stimulated at 23/13°C and a PPFD ranging between 300 and 500 μmol·m~(-2)·s~(-1). These conditions seem to approximate the optimum conditions for CO2 assimilation.
机译：我们调查了光强度和温度对Odontioda兰花的生长，开花和单叶CO2同化的影响。在约30°C的叶片温度下，背面和当前梢的最终叶片中的CO2同化作用显着降低，这与气孔导度降低有关，尽管背面和当前梢之间的光饱和点有所不同。大约400μmol·m〜（-2）·s〜（-1）的光合光子通量密度（PPFD）最适合CO2吸收。在高光下，大量的糖和淀粉保留在后芽的假鳞茎中，但是当当前的芽正在发育新的叶片时，它们的含量下降。当增长停止时，储备同化物的数量再次增加。因此，在后芽和当前芽的假鳞茎之间似乎有同化物的动态移位。在实验开始后的两个月内，所有在28/18°C（白天/夜晚）下种植的植物都死亡，证实该物种具有较低的耐热性。在23/13℃和PPFD在300和500μmol·m〜（-2）·s〜（-1）之间刺激生长和开花。这些条件似乎近似于CO 2同化的最佳条件。

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