Preston C, Holtum J A, Powles S B
Department of Crop Protection, Waite Agricultural Research Institute, The University of Adelaide, PMB 1, Glen Osmond South Australia 5064, Australia.
Plant Physiol. 1991 May;96(1):314-8. doi: 10.1104/pp.96.1.314.
Photoinhibition was examined in paraquat-resistant and paraquat-susceptible biotypes of Hordeum glaucum Steud., Hordeum leporinum Link., Arctotheca calendula (L.) Levyns., and Conyza bonariensis (L.) Cronq. Plants were photoinhibited at low temperature, and the extent of photoinhibition determined by O(2) evolution and 77 K fluorescence. No difference in the degree of photoinhibition was detected between paraquat-resistant and paraquat-susceptible biotypes for any of the species examined. C. bonariensis plants were also photoinhibited by treatment without CO(2) at either 21% (volume/volume) O(2) or 4% (volume/volume) O(2), and again no difference was observed between the paraquat-resistant and paraquat-susceptible biotypes in reduction of the ratio of variable fluorescence to maximal fluorescence. This is in contrast to a recent report (MAK Jansen, Y Shaaltiel, D Kazzes, O Canaani, S Malkin, J Gressel, [1989] Plant Physiol 91: 1174-1178 in which it was claimed that a paraquat-resistant biotype of C. bonariensis was more tolerant of photoinhibition than a paraquat-susceptible biotype. We conclude that paraquat-resistant biotypes of these plant species are not more tolerant of photoinhibition when compared with the paraquat-susceptible biotypes.
对灰毛大麦草、野兔草、金盏银盘和银胶菊的抗百草枯和易受百草枯影响的生物型进行了光抑制研究。植物在低温下受到光抑制，光抑制程度通过氧气释放和77K荧光来测定。在所研究的任何物种中，未检测到抗百草枯和易受百草枯影响的生物型之间光抑制程度的差异。银胶菊植株在21%（体积/体积）氧气或4%（体积/体积）氧气条件下，经无二氧化碳处理也会受到光抑制，并且在抗百草枯和易受百草枯影响的生物型之间，可变荧光与最大荧光比值的降低方面同样未观察到差异。这与最近的一份报告（MAK詹森、Y沙尔蒂尔、D卡泽斯、O卡纳尼、S马尔金、J格雷塞尔，[1989]《植物生理学》91: 1174 - 1178）形成对比，该报告称银胶菊的抗百草枯生物型比易受百草枯影响的生物型更耐光抑制。我们得出结论，与易受百草枯影响的生物型相比，这些植物物种的抗百草枯生物型对光抑制的耐受性并不更强。
