| quantitative structure-activity relationships for 2-[(phenylmethyl)sulfonyl]pyridine 1-oxide herbicides. | phenyl-substituted analogues of 2-[(phenylmethyl)sulfonyl]pyridine 1-oxide preemergent herbicides were examined in order to determine quantitative relationships between structure and activity against the following three weed species: switch grass (panicum virgatum l.), barnyard grass (echinochloa crusgalli l. beauv.), and green foxtail (setaria viridis l. beauv.). analogues were chosen to provide maximum parameter orthogonality. regression analysis yielded structure-activity relationships wherei ... | 1983 | 6834380 |
| plastid development in seedlings of echinochloa crus-galli var. oryzicola under anoxic germination conditions. | plastid development in the primary leaf of echinochloa crus-galli (l.) beauv. var. oryzicola (vasing.) ohwi was followed during 5 d of anoxic germination and growth. plastids develop slowly from simple spheroidal proplastids into larger pleomorphic plastids with several stromal membranes and many peripheral membrane vesicles. a small prolamellar body is present at 96 h with perforated (pro)thylakoids extending into the stroma. changes in starch grains and plastoglobuli are evidence of carbohydra ... | 1982 | 24271619 |
| anaerobic metabolism in germinating seeds of echinochloa crus-galli (barnyard grass) : metabolite and enzyme studies. | echinochloa crus-galli, a problem weed in rice fields, has the rare ability to germinate and to grow in a totally oxygen-free environment. after 7 days growth in the light or dark under n(2), e. crus-galli var. oryzicola produces a 2- to 3-centimeter nonpigmented shoot.ethanol, malate, and lactate were measured in seeds germinated under n(2) and air, and compared with changes in the activities of alcohol dehydrogenase, malate dehydrogenase, nadp-malic enzyme, and phosphoenolpyruvate carboxylase. ... | 1981 | 16661863 |