摘要
以 3 5个不同栽培类型的小麦品种 (系 )作为试验材料 ,根据其 6叶幼苗的根系形态性状进行聚类分析 ,供试材料的根系类型分为 3种 :大根系、小根系和中间型根系。具有中间型根系的材料反复干旱存活率最高 ,这些材料的根系特点是单株根数 7～ 8.5条 ,最大根长 2 0～ 2 2 cm,根总干重 44～ 48mg,其中 1 0 cm以下根干重占 3 6 %～ 45 % ,根冠比范围在 0 .2 2～0 .2 4。一些水地栽培的育成品种苗期抗旱性较强 ,旱地栽培的育成品种苗期抗旱性差异较大 ,个别旱地栽培的地方品种在土壤水分胁迫条件下反而比在正常水分条件下的根系发育更好 。
varieties (lines) of wheat(T.aestivum L.) which were grown under different soil moisture conditions were studied.The results showed that there were three root patterns in the experimental materials based on clustering analyses for root morphology traits of seedlings with 6 leaves.They were large root,small root and intermediate root.Varieties whose seedlings possessed intermediate root had the highest survival percentage of repeated drought.The character of intermediate root morphology for per plant were from 7 to 8.5 roots,from 44 mg to 48 mg total root dry weight(RDW),in which from 36% to 45% rate of RDW below 10 cm,and from 0.22 to 0.24 ratio of root to shoot.Seedlings of some bred varieties grown under irrigation condition had high survival.The seedling survival of bred varieties grown under dryland condition displayed diversity.The seedling roots of several landraces grown under dryland condition developed better under soil water stress condition than normal soil moisture.Adaptation to the soil water stress for a long term was probably the main reason for these landraces.
出处
《西北植物学报》
CAS
CSCD
2002年第2期243-249,共7页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家重点基础研究发展规划项目 ( G1 9990 1 1 70 0)
关键词
小麦
根系形态
反复干旱存活率
幼苗
wheat
root morphology
survival percentage under repeated drought condition
