We assessed the pollen hydration, the pollen germination, and the stigma papilla penetration of CROCUS VERNUS subsp. VERNUS (Iridaceae) after 2 h fumigations with O (3), NO (2), and CO gases within humidified (90 - 100 % RH) box experiments. When the pollen and the pistil were separately fumigated, the pollen retained the capacity to emit a tube which penetrated papilla, and the stigma papillae retained the receptivity; when the pistils were first pollinated and then fumigated, the capacity of pollen to hydrate was not affected, but the germination was significantly reduced. The vulnerability to gases became evident at 0.3 ppm O (3), 0.2 ppm NO (2), and 0.5 ppm CO. The inhibition curves as a function of the gas concentrations were of an exponential type, and they saturated at 2 ppm NO (2), 25 ppm CO, and 0.5 ppm O (3), with germination percentages of 17 %, 27 %, and 60 %, respectively. Both the pollen germination and the papilla penetration were fully restored by prolonging for 60 - 90 min the incubation at 90 - 100 % RH, after the cessation of fumigations. The vulnerability of the pollen-papilla system is discussed.

译文

我们评估了番红花亚种的花粉水化,花粉萌发和柱头乳头渗透。在加湿 (90-100% RH) 盒实验中用O (3),NO (2) 和CO气体熏蒸2小时后的VERNUS (鸢尾科)。当花粉和雌蕊分别熏蒸时,花粉保留了穿透乳头的试管的能力,柱头乳头保留了感受性; 当雌蕊先授粉后熏蒸时,花粉的水合能力没有受到影响,但萌发明显降低。在0.3 ppm O (3) 、0.2 ppm NO (2) 和0.5 ppm CO时,对气体的脆弱性变得明显。作为气体浓度的函数的抑制曲线是指数型的,它们在2 ppm NO (2),25 ppm CO和0.5 ppm O (3) 下饱和,发芽率分别为17%,27% 和60%。熏蒸停止后,通过在90-100% RH下孵育60-90分钟,花粉萌发和乳头渗透都完全恢复。讨论了花粉-乳头系统的脆弱性。

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