PEG模拟干旱胁迫下8种绿肥作物萌发特性与抗旱性评价

doi:10.11686/cyxb20150309

摘要/Abstract

摘要： 采用不同浓度PEG-6000溶液模拟干旱胁迫的方法，对大麦、黑麦草、二月兰等8种绿肥种子的萌发特性和抗旱性进行了研究。研究结果表明:1)低浓度的PEG-6000对大麦、冬牧70黑麦、毛叶苕子等7种绿肥作物种子的萌发有一定促进作用。2)低浓度的PEG-6000对8种绿肥作物种子胚根的伸长均有一定的促进作用，但对胚芽反而表现出抑制作用。3)随着胁迫程度的加剧，8种绿肥作物种子的发芽率、胚根长、胚芽长、萌发胁迫指数、萌发抗旱指数不断下降，而胚根/胚芽比值却持续上升。4)利用隶属函数分析得出8种绿肥作物种子萌发期的抗旱性强弱次序为:籽粒苋＞白芥末＞黑麦草＞冬牧70黑麦＞沙打旺＞毛叶苕子＞大麦＞二月兰，据其综合评价值分为3类，籽粒苋、白芥末为强抗旱作物种类，黑麦草、冬牧70黑麦、沙打旺、毛叶苕子、大麦为中等抗旱作物种类，二月兰为弱抗旱作物。因此，抗旱性强的籽粒苋、白芥末适宜在黄淮海地区干旱少雨的地区种植。

Abstract: The experiment was conducted to estimate the seed germination characteristics and drought resistance of seeds of eight green manure crop species (Amaranthus hypochondriacus; Sinapis alba; Lolium multiflorum; Secal ecerale; Astragalus adsurgens;Vicia villosa; Hordeum vulgare; Orychophragmus violaceus) by simulating drought stress using different concentrations of polyethylene glycol (PEG)-6000 solution. Low concentrations of PEG-6000 improved seed germination in seven species including H. vulgare, S. cerale and V. villosa. Low PEG-6000 concentration improved the radicle length in all species but reduced plumule length. Seed germination, radicle length, plumule length, germination stress index and germination drought resistance index of all species decreased with increasing PEG-6000 concentration, while the radicle-plumule ratio increased. The order of drought-resistance of the eight species tested was: A. hypochondriacus＞S. alba＞L. multiflorum＞S. cerale＞A. adsurgens＞V. villosa＞H. vulgare＞O. violaceus. Three drought resistant classes: high (A. hypochondriacus and S. alba), medium (L. multiflorum, S. cerale, A. adsurgens, V. villosa and H. vulgare) and low (O. violaceus) were identified. Species with high drought resistance are probably the most suited to the Huanghuaihai Plain.

孙艳茹，石屹，陈国军，闫慧峰. PEG模拟干旱胁迫下8种绿肥作物萌发特性与抗旱性评价[J]. 草业学报, 2015, 24(3): 89-98.

SUN Yanru, SHI Yi, CHEN Guojun, YAN Huifeng. Evaluation of the germination characteristics and drought resistance of green manure crops under PEG stress[J]. Acta Prataculturae Sinica, 2015, 24(3): 89-98.

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