作物学报 ›› 2013, Vol. 39 ›› Issue (08): 1514-1519.doi: 10.3724/SP.J.1006.2013.01514
• 研究简报 • 上一篇
张磊,吕金印*,贾少磊
ZHANG Lei,LÜ Jin-Yin*,JIA Shao-Lei
摘要:
为明确干旱胁迫对小麦穗部花前同化物合成和转运的影响,选用旱地品种西农928和水分敏感品种郑引1号,通过14CO2标记技术研究了水分亏缺下穗部光合特性及穗部花前同化物的转运和分配规律。水分亏缺条件下,西农928灌浆前期、中期的穗部净光合速率、颖壳中叶绿素含量及可溶性总糖含量略有下降,而郑引1号显著下降。成熟期西农928的水分利用效率上升1.7% (P>0.05),籽粒中14C-同化物分配率略降3.2% (P>0.05);而郑引1号水分利用效率下降16.9% (P<0.05),籽粒中花前14C-同化物分配率上升7.8% (P<0.05)。试验表明,水分亏缺对西农928穗部光合的影响有限; 适度水分亏缺促进了水分敏感品种郑引1号颖壳及内外稃中花前14C-同化物向籽粒的转运, 相对提高了其穗部花前光合同化物对籽粒灌浆的贡献率。
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