摘要
以5个水稻品种(农垦57、泗优917、扬稻6号、汕优63和巴西旱稻)为试验材料,在pH4.5和6.5的条件下分别供应NH+4-N和NO-3-N2种形态氮源,利用石蜡切片技术研究低pH条件下,不同氮形态对水稻根系通气组织形成的影响。结果表明:所有处理中,距水稻幼苗根尖0～10mm内和15mm处通气组织都未明显发育,但在距根尖25mm处的切片显示出明显的差异。在近中性条件(pH6.5)下,氮源的形态对水稻根通气组织的发育几乎没有影响。在低pH条件下,NH+4-N加快了籼稻(扬稻6号和汕优63)皮层细胞通气组织的形成,而NO-3-N减慢了粳稻(农垦57和泗优917)和旱稻(巴西旱稻)通气组织的形成。
<Abstrcat> Five varieties of rice (Oryza sativa L.), Nongken 57 (conventional japonica), Siyou 917 (hybrid japonica), Yangdao 6 (conventional indica), Shanyou 63 (hybrid indica) and Brazilian upland rice, were applied to investigate the effects of two nitrogen sources, NH^+_4-N and NO^-_3-N, on cortical aerenchyma formation of roots under low pH level (pH 45) through paraffin section technique. Results indicated that cross-sections of all rice roots at 5 mm and 15 mm from the root apex didn't present significant difference, but showed obvious difference at 25 mm from the root apex. Nitrogen forms had little effect on aerenchyma formation of rice roots under near neutral condition (pH 65), but at low pH level (pH 45) the presence of NH^+_4-N accelerated aerenchyma formation of indica rice (Yangdao 6 and Shanyou 63) roots while NO^-_3-N delayed that of japonica (Nongken 57 and Siyou 917) and upland rice roots (Brazilian upland rice).
出处
《扬州大学学报（农业与生命科学版）》
CAS
CSCD
北大核心
2005年第2期66-70,共5页
Journal of Yangzhou University：Agricultural and Life Science Edition
基金
国家自然科学基金资助项目(30270783)
扬州大学自然科学基金资助项目(SK0313097)
