Comparison of Triazine-Resistant and -Susceptible Biotypes of Senecio vulgaris and Their F1 Hybrids

作者：Amy E. Stowe, Jodie Sims Holt · 发表于：PLANT PHYSIOLOGY · 年份：1988 · DOI：10.1104/pp.87.1.183 · 被引用次数：35 · 研究领域：Soil Carbon and Nitrogen Dynamics、Weed Control and Herbicide Applications、Pesticide and Herbicide Environmental Studies

The relationship of triazine resistance to decreased plant productivity was investigated in Senecio vulgaris L. F(1) reciprocal hybrids were developed from pure-breeding susceptible (S) and resistant (R) lines. The four biotypes (S, S x R, R, R x S) were compared in terms of atrazine response, electron transport, carbon fixation, and biomass production. Atrazine response, carbon fixation rate, and PSII and whole-chain electron transport rates of hybrids were nearly identical to those of their respective maternal parents. Significant differences occurred between the two susceptible (S, S x R) and two resistant (R, R x S) biotypes in atrazine response (I(50)), carbon fixation rate, and PSII and whole-chain electron transport rates; PSI rates were identical in all four biotypes. Coupled and uncoupled, whole-chain electron transport rates of thylakoids of the two susceptible biotypes were approximately 50% greater than those of the two resistant biotypes at photon flux densities greater than 215 micromoles per square meter per second. Carbon exchange rates of the two susceptible biotypes were 23% greater than those of the two resistant biotypes. Hybrid biotypes (S x R, R x S) were not identical to their maternal parents in biomass production. The S, S x R, and R x S plants all achieved greater biomass than R plants. These results suggest that while the resistance mutation influences thylakoid performance, reduced productivity of triazine-resistant plants cannot be ascribed solely...