不同灌水条件下春小麦不同器官碳同位素分辨率与产量的相关性

Correlation between Carbon Isotope Discrimination of Different Organs and Yield of Wheat under Different Irrigations

为确定碳同位素分辨率(Δ13 C)用于春小麦高产节水品种选育的最佳测定时期和器官,以2个小麦地方品种、14个育成品种(系)和2个引进品种为试验材料进行不同灌水处理,分析了小麦旗叶、茎秆和籽粒Δ13 C值的差异及其与产量的相关性。结果表明,同一品种不同部位Δ13 C存在较大差异,籽粒Δ13 C均低于开花期旗叶和基部秸秆、成熟期旗叶和基部秸秆的Δ13 C。小麦材料相同部位的Δ13 C在中度水分胁迫处理(T2)下低于其他灌水处理(T1、T3和T4),在T2和轻度水分胁迫处理(T3)下,拔节期旗叶Δ13 C与产量均呈显著负相关;在T3处理下,成熟期籽粒Δ13 C与产量呈显著正相关。

In order to determine the best determination stage and organ of the carbon isotope discrimi- nation （△^13C） used to breed high-yield and water saving varieties,2 local wheat landraces, 14 bred va- rieties （lines） and 2 introduced varieties were grown with different irrigation treatments in Ningxia. The correlation between the △^13C in leaf, stem and grain with yield of wheat were analyzed. The re- sults showed that there were bigger variation for the A of the same variety in different organs, the△^13C of wheat grain was lower than that of flag leaf and stems at flowering and mature stage. The △^13C of wheat grain under medium drought treatment （T2） was lower than that under other irrigation treatments （T1, T3 and T4）, the △^13C of flag leaf at jointing stage was significantly and negatively associated with yield under both medium drought treatment （T2） and mild drought treatment （T3）; the △^13C of grain was significantly and positively associated with yield under mild drought treatment （T3）.