【摘要】 一株麦苗的主茎和各分蘖的心叶(-1叶)和它里边的一片叶(-2叶)的长度比率,称为-1/-2叶差距。以叶差距为指标反映分蘖、蘖群和植株的生长势,即叶差距小,表示当时和进一步的生长趋势是增强;叶差距大,则表示减弱。一个蘖群中各个分蘖的生长势,在分蘖期,一般表现为子蘖优势,但也有的蘖群和植株表现为亲蘖优势,这一差异可以考虑用于反映品种的分蘖力强弱,和反映体内生理状况和环境条件的影响;在分蘖两极分化期,一般地表现为亲蘖优势,用-1/-2叶差距在各蘖间的差异增大,可以表示分蘖两极分化程度,反映当时和前一时期体内外条件的影响。在分蘖两极分化前(返青到起身)中(起身到拔节)期,-1/-2叶差距大于10可作为判断无效分蘖的指标。更多还原

【Abstract】 The length ratio between the newly emerging young leaf(-1)and theyounger one (-2) is used as an index (LLR-1/-2) for the reflection ofthe growth potential of tillers,tiller groups and whole plants.The lowervalue of LLR indicates the stronger growth potential.During the tillering period,in general,the growth potential of seco-ndary tillers is dominant in a tiller group.But sometimes,in certain ti-ller groups and plants,main tiller shows dominant.Thus,according tothe difference between main tiller and secondary tillers dominance,thetillering ability of varieties could be noticed.It also may be used to an-alyse the changes of physiological processes and influence of environmentalconditions.During the period of tiller polarization,as the main tillers showdominant,the tillers in a plant may develop into effective or ineffective.At this time,LLR-1/-2>10 is used as an index to indicate the ineffect-ive tillers.The degree of tiller polarizaation could be determind accordingto the percentage of ineffective tillers in plants indicated.更多还原