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首页> 美国卫生研究院文献>Plant Physiology >Differential Light Responses of Photosynthesis by Triazine-resistant and Triazine-susceptible Senecio vulgaris Biotypes
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Differential Light Responses of Photosynthesis by Triazine-resistant and Triazine-susceptible Senecio vulgaris Biotypes

机译：三嗪抗性和易受三嗪易感千里光寻常型生物合成的光合作用的不同光响应。

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摘要

Studies were conducted to determine a physiological basis for competitive differences between Senecio vulgaris L. biotypes which are either resistant or susceptible to triazine herbicides. Net carbon fixation of intact leaves of mature plants was higher at all light intensities in the susceptible biotype than in the resistant biotype. Quantum yields measured under identical conditions for each biotype were 20% lower in the resistant than in the susceptible biotype. Oxygen evolution in continuous light measured in stroma-free chloroplasts was also higher at all light intensities in the susceptible biotype than in the resistant biotype. Oxygen evolution in response to flashing light was measured in stroma-free chloroplasts of both biotypes. The steady-state yield per flash of resistant chloroplasts was less than 20% that of susceptible chloroplasts. Susceptible chloroplasts displayed oscillations in oxygen yield per flash typically observed in normal chloroplasts, whereas the pattern of oscillations in resistant chloroplasts was noticeably damped. It is suggested that modification of the herbicide binding site which confers s-triazine resistance may also affect the oxidizing side of photosystem II, making photochemical electron transport much less efficient. This alteration has resulted in a lowered capacity for net carbon fixation and lower quantum yields in whole plants of the resistant type.
机译：进行研究以确定对三嗪除草剂具有抗性或敏感性的寻常千里光生物型之间的竞争差异的生理基础。在所有光照强度下，易感生物型的成熟植物完整叶片的净碳固定率均高于抗性生物型。在相同条件下针对每种生物型测得的量子产率与抗药性生物型相比，抗性降低了20％。在无基质叶绿体中测得的连续光中的氧气释放在所有光强度下在易感生物型中也比抗性生物型中的高。在两种生物型的无基质叶绿体中测量了响应闪光灯的氧气释放。耐性叶绿体每闪的稳态产量低于敏感叶绿体的20％。易感的叶绿体通常在正常的叶绿体中观察到每闪的氧气产量振荡，而抗性叶绿体的振荡模式明显被抑制。提出赋予s-三嗪抗性的除草剂结合位点的修饰也可能影响光系统II的氧化侧，从而使光化学电子传递的效率大大降低。这种改变导致抗性类型的整个植物的净碳固定能力降低，量子产率降低。

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