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为了表示不同的葡萄种或品种的耐旱特性,对它们的离体叶片在萎蔫期间的水势(4w)和水分丧失的变化进行了测定。 1.从生长在田间的葡萄植株上取下叶片,使之充分吸水,然后测定萎蔫期间的水分丧失和水势。绘成水势与失水关系图,证明耐旱品种‘RieSIing’的相对持水量比干旱敏感品种‘Miiller—Thwgau’更大。 2.连续4年测定了从完全紧胀到膨压为零之间的水分丧失,表明耐旱品种(如Riesling)在到达零膨压之前能释放出较多的水分,因为它们的贮水能力较强。 3.计算了17个品种的叶组织的总弹性模数(the bulk modulus of elasticitr),结果表明,弹性与膨压为零时的水分丧失显著相关。耐旱品种比干旱敏感品种具有更高的弹性性能。这些实验可供进行耐旱性筛选时参考。
To characterize the drought tolerance of different grapevine varieties or cultivars, changes in water potential (4w) and water loss of their detached leaves during wilting were determined. 1. Remove the leaves from the grape plants growing in the field to allow them to fully absorb water, then measure the water loss and water potential during wilting. The relationship between water potential and water loss was plotted to show that the relative water holding capacity of drought tolerant ’RieSIing’ was greater than that of the drought sensitive cultivar ’Miiller-Thwgau’. 2. The loss of water from full tightening to zero tumescence was measured for four consecutive years, indicating that drought tolerant species, such as Riesling, release more water before reaching zero turgor because of their ability to store water Strong. Calculated the total modulus of elasticity of leaf tissue of 17 cultivars, the results show that there is a significant correlation between the elasticity and the loss of water when the turgor is zero. Drought-tolerant varieties have higher elastic properties than drought-sensitive varieties. These experiments are available for drought tolerance screening.