Jabben M, Deitzer G F
Smithsonian Radiation Biology Laboratory, 12441 Parklawn Drive, Rockville, Maryland 20852.
Plant Physiol. 1979 Mar;63(3):481-5. doi: 10.1104/pp.63.3.481.
The herbicide, 4-chloro-5-(methylamino)-2-(alpha,alpha,alpha-trifluoro-m-tolyl)- 3(2H)-pyridazinone (San 9789), an inhibitor that prevents both carotenoid and chlorophyll accumulation and normal chloroplast development in white light, does not affect the physiological effectiveness of phytochrome in dark-and light-grown plants. Red/far red reversibility of growth inhibition, stimulation of anthocyanin synthesis, and stimulation of phenylalanine ammonia-lyase synthesis are not significantly different in plants grown with and without San 9789. Despite the complete absence of photosynthesis, flowering could be induced in the long day plant Hordeum vulgare L. when sucrose was provided to the leaves. Since the nonphotochemical reactions of phytochrome also are not affected by the herbicide, San 9789 may be used as a tool to study the phytochrome system spectrophotometrically in plants grown for relatively long periods under high intensity white light.
除草剂4-氯-5-（甲氨基）-2-（α，α，α-三氟间甲苯基）-3（2H）-哒嗪酮（San 9789）是一种抑制剂，它能阻止类胡萝卜素和叶绿素的积累以及在白光下正常叶绿体的发育，但不影响黑暗中和光照下生长的植物中光敏色素的生理效应。在有和没有San 9789的情况下生长的植物中，生长抑制的红/远红可逆性、花青素合成的刺激以及苯丙氨酸解氨酶合成的刺激没有显著差异。尽管完全没有光合作用，但当向叶片提供蔗糖时，长日照植物大麦（Hordeum vulgare L.）仍可诱导开花。由于光敏色素的非光化学反应也不受该除草剂的影响，因此San 9789可作为一种工具，用于对在高强度白光下生长较长时间的植物中的光敏色素系统进行分光光度研究。
