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首页> 外文期刊>BMC Plant Biology >An evaluation of the effects of exogenous ethephon, an ethylene releasing compound, on photosynthesis of mustard ( Brassica juncea ) cultivars that differ in photosynthetic capacity
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An evaluation of the effects of exogenous ethephon, an ethylene releasing compound, on photosynthesis of mustard ( Brassica juncea ) cultivars that differ in photosynthetic capacity

机译：评价外源乙烯利（乙烯释放化合物）对光合作用能力不同的芥菜（芥菜）光合作用的影响

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Background The stimulatory effect of CO2 on ethylene evolution in plants is known, but the extent to which ethylene controls photosynthesis is not clear. Studies on the effects of ethylene on CO2 metabolism have shown conflicting results. Increase or inhibition of photosynthesis by ethylene has been reported. To understand the physiological processes responsible for ethylene-mediated changes in photosynthesis, stomatal and mesophyll effects on photosynthesis and ethylene biosynthesis in response to ethephon treatment in mustard ( Brassica juncea ) cultivars differing in photosynthetic capacity were studied. Results The effects of ethephon on photosynthetic rate (PN), stomatal conductance (gS), carbonic anhydrase (CA) activity, 1-aminocyclopropane carboxylic acid synthase (ACS) activity and ethylene evolution were similar in both the cultivars. Increasing ethephon concentration up to 1.5 mM increased PN, gS and CA maximally, whereas 3.0 mM ethephon proved inhibitory. ACS activity and ethylene evolution increased with increasing concentrations of ethephon. The corresponding changes in gs and CA activity suggest that the changes in photosynthesis in response to ethephon were triggered by altered stomatal and mesophyll processes. Stomatal conductance changed in parallel with changes in mesophyll photosynthetic properties. In both the cultivars ACS activity and ethylene increased up to 3.0 mM ethephon, but 1.5 mM ethephon caused maximum effects on photosynthetic parameters. Conclusion These results suggest that ethephon affects foliar gas exchange responses. The changes in photosynthesis in response to ethephon were due to stomatal and mesophyll effects. The changes in gS were a response maintaining stable intercellular CO2 concentration (Ci) under the given treatment in both the cultivars. Also, the high photosynthetic capacity cultivar, Varuna responded less to ethephon than the low photosynthetic capacity cultivar, RH30. The photosynthetic capacity of RH30 increased with the increase in ethylene evolution due to 1.5 mM ethephon application.
机译：背景技术CO 2 对植物体内乙烯释放的刺激作用是已知的，但乙烯控制光合作用的程度尚不清楚。关于乙烯对CO 2 代谢的影响的研究显示出相互矛盾的结果。已经报道了乙烯增加或抑制光合作用。为了了解负责乙烯介导的光合作用变化的生理过程，研究了在光合作用能力不同的芥菜（甘蓝型）品种中，乙烯利处理后气孔和叶肉对光合作用和乙烯生物合成的影响。结果乙烯利对光合速率（P N ），气孔导度（g S ），碳酸酐酶（CA）活性，1-氨基环丙烷羧酸合酶（ACS）的影响两个品种的活性和乙烯进化相似。将乙烯利浓度提高至1.5 mM可使P N ，g S 和CA最大化，而3.0 mM乙烯利则具有抑制作用。随着乙烯利浓度的增加，ACS活性和乙烯的释放增加。 g s 和CA活性的相应变化表明，气孔和叶肉过程的改变触发了响应乙烯利的光合作用变化。气孔电导率与叶肉光合特性的变化同时发生。在两个品种中，ACS活性和乙烯均增加了高达3.0 mM的乙烯利，但1.5 mM的乙烯利对光合参数的影响最大。结论这些结果表明，乙烯利影响叶面气体交换反应。响应乙烯利的光合作用变化是由于气孔和叶肉的作用。在给定处理下，两个品种中g S 的变化是维持稳定的细胞间CO 2 浓度（C i ）的响应。同样，高光合能力品种Varuna对乙烯利的反应比低光合能力品种RH30少。 RH30的光合能力随着乙烯释放量的增加而增加，这是由于使用了1.5 mM的乙烯利。

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