CAJ | 학술논문

对番茄和羽扇豆在不同磷浓度水培中的应答机制作了系统分析.结果表明,在低磷条件下羽扇豆和番茄根系有机酸、酸性磷酸酶和植酸酶分泌量均有所增加.但下列表现差异明显:①羽扇豆根系酸性磷酸酶分泌量明显高于番茄,而植酸酶分泌量则趋势相反.②羽扇豆根系有机酸的分泌增高量显著高于番茄.③番茄诱发应答反应的介质磷浓度显著比羽扇豆高(前者约为300μmol/L,而后者为10μmol/L)④番茄诱导应答反应时的内部磷含量(PTPC)亦比羽扇豆高(前者为4.2mg P·g-1,后者为1.5mg P·g-1).以上结果显示,在正常生长过程中番茄对磷的需求量明显高于羽扇豆,可能是导致其对磷缺乏适应能力低下的重要因素.同时缺磷条件下根系诱导分泌酸性磷酸酶、植酸酶和有机酸可能是植物获取磷酸盐,改善根际营养状况的重要适应机制.
대번가화우선두재불동린농도수배중적응답궤제작료계통분석.결과표명,재저린조건하우선두화번가근계유궤산、산성린산매화식산매분비량균유소증가.단하렬표현차이명현:①우선두근계산성린산매분비량명현고우번가,이식산매분비량칙추세상반.②우선두근계유궤산적분비증고량현저고우번가.③번가유발응답반응적개질린농도현저비우선두고(전자약위300μmol/L,이후자위10μmol/L)④번가유도응답반응시적내부린함량(PTPC)역비우선두고(전자위4.2mg P·g-1,후자위1.5mg P·g-1).이상결과현시,재정상생장과정중번가대린적수구량명현고우우선두,가능시도치기대린결핍괄응능력저하적중요인소.동시결린조건하근계유도분비산성린산매、식산매화유궤산가능시식물획취린산염,개선근제영양상황적중요괄응궤제.
Responses of aquicultured lupin and tomato plants to low phosphorus(P) concentrations in the growth me dia were compared. Under the low P condition, the lupin and tomato plants exhibited similar responses though the rates of the responses were different. These responses included an increased secretion of organic acids, A pase and phytase by roots. However, the following differences were apparent. (1) The increase of Apase secre tion was higher in lupin roots than in tomato roots while the increase of phytase secretion was reverse. (2) The increase of organic acid secretion was considerably higher in lupin than that in tomato. (3) The external thresh old P concentration in growth media to induce the responses was considerably lower in lupin (approximately 10 μmol/L) than in tomato (300 μmol/L P). (4) The physiological threshold P content (PTPC), an internal P content to induce the response, was considerably higher in tomato (4.2 mg P · g 1) than in lupin (1.5 mg P · g-1). Indicating that the P requirement of tomato for normal growth was quite higher than that of lupin plant. It was considered that the high P requirement of tomato for normal growth was the most important factor in the low adaptive ability to P deficient conditions. The secretion of Apase, phytase and organic acids by roots pro vides a set of adaptive mechanisms by which plants can enhance the availability of P and therefore alter the nutri ent status in the rhizosphere.