摘要
应用盆栽试验研究了石灰性土壤上玉米与花生间作对花生铁营养的影响,结果表明,问作显著地改善了花生的铁营养状况。进一步研究发现这种改善作用与间作对花生根系形态和生理活性所产生的影响密切相关。间作不仅增加了花生的侧根数目、侧根长度、根毛数量,而且促使花生表皮形成丰富的转移细胞和根质膜还原Fe(Ⅲ)能力的提高;同时间作花生根际微生物数量少于单作花生,可能减少了对玉米根系分泌的植物铁载体(PS)和根表粘液层的分解,间作花生根表较厚的粘液层和根际丰富的PS-Fe^(31)促进了间作花生对根际土壤难溶性铁Fe(Ⅲ)的吸收和利用。间作花生的这些根系形态变化、生理变化在改善花生铁营养方面具有重要的生理生态学意义。
Pot experiment was carried out to study the effect of intercropping peanut with
maize on the iron nutrition of peanut. The results showed that the intercropping improved iron
nutrition of peanut remarkably. It also indicated that the effect of intercropping on root morpho-
logical and physiological changes of peanut were significantly related to the improvement of iron
nutrition. The intercropping increased lateral root length and greater number of lateral root. In
tercropping led to development of rhizodermal transfer cells and great number of root hairs at the
subapical root zone. At the same time, intercropping could maintain high Fe( III ) reducing capac
ity of peanut for a longer time. Fewer microorganisms of peanut intercropped with maize could
reduced the decomposition of the mucous layer of cell surface and the root exudates (phy-
tosiderophores) of maize. The thicker mucous layer and larger amount of PS-Fe3+ of intercrop
ping rhizosphere soil increased the iron uptake and utilization of peanut. Consequently, the root
morphological and physiological changes of peanut intercropped with maize played an important
role on the improvement iron nutrition of peanut ecophysiologically.
出处
《作物学报》
CAS
CSCD
北大核心
1998年第5期558-563,共6页
Acta Agronomica Sinica
基金
国家自然科学基金
博士点资助项目
关键词
间作
花生
玉米
生理反应
石灰性土壤
根系
Intercropping
Maize
Peanut
Root morphological changes
Root Physiological changes
