不同抗旱型冬小麦品种根系水力导度与解剖结构的关系

为了了解冬小麦根系水力导度(Lpr、)根系解剖结构以及品种抗旱性三者之间的关系,在人工气候室水培条件下,研究了长武134、陕253和小偃6号3个不同抗旱类型冬小麦品种根系水力导度的变化及其与解剖结构之间的关系。结果发现,水分胁迫下,冬小麦各品种的根系Lpr与木质部中央大导管直径均降低,而根系直径和皮层厚度则增加。但总体上抗旱性越强的冬小麦品种根系Lpr越低,木质部中央导管直径越小,根系直径与皮层厚度越大;冬小麦根系Lpr与木质部中央大导管直径呈显著正相关关系,与根系直径及皮层厚度均呈显著负相关关系。该结果为提高冬小麦品种水分利用效率与抗旱性的遗传育种研究提供了理论依据。

Relationship between roots hydraulic conductivity and root anatomy of winter wheat (T.aestivum)

In this study,three varieties of winter wheat(Changwu 134,Xiaoyan 6 and Shaan 253) with different drought-resistance were used to understand the relationships among roots Lpr,roots anatomy and drought-resistance under the condition of solution culture in climatron.The results indicated that under water stress condition,roots Lpr and xylem vessel diameter decreased compared with control,while roots diameter and cortex width increased for all the varieties of winter wheat.Under the same water treatments,the wheat varieties with stronger drought-resistance had the lower Lpr;the smaller xylem vessel diameter,showed the bigger root diameter and cortex width.Roots Lpr was obviously positively correlated with the xylem vessel diameter (r=0.86),and obviously negatively correlated with the root diameter(r=0.76) and cortex width(r=0.79).This result will provide scientific references for genetic breeding to improve the water use efficiency(WUE) and drought-resistance of winter wheat.