【摘要】 籽粒干重增重率(Y)与距抽穗日数(x)的关系呈 S 型曲线,配合 Logisfic方程后发现,品种间强势粒的增重过程可用同一方程表示,而弱势粒增重过程的品种间差异显著,故不同品种的籽粒增重特征应集中反映于它们强、弱势粒位间增重模型差异的性质上。二棱大麦(Hordeum distichum)强、弱势粒问呈同步增重型,多棱大麦(H.vulgare)呈异步增重型,从中又可区分为弱势粒初期滞增亚型(多棱疏穗大麦)与弱势粒后期早衰亚型(多棱密穗大麦)两种。上述特征在遮穗、剪叶、剪芒和部分剪穗条件下仍能充分反映,这说明上述区分应内涵其一般生物学意义。改变条件时,异步增重型品种的弱势粒表现出强烈的粒重调节能力。更多还原

【Abstract】 In 1981 and 1982,the process of increase of grain weight in 4 differentvarieties（types）of barley was investigated.It was found that the processesof strong-and weak-grains were different among varieties.1.For the strong-grain,the relationship between the filling rate ofgrain Weight and the number of days after heading may be fitted by thesame logistic equation,irrespective of the varieties.For the weak-grain,however,the relationship in different varieties must be described by logi-stic equations with respective parameters.2.According to the characteristics of the process,barley varietiesmay be distinguished as follows:A—synchronous type,H.distichum,in which the process of increaseof strong-grain is in coincidence with that of weak-grain.B—asynchronous type,H.vulgare,the process of strong-grain doesn’tcoincide with that of weak-grain.B₁—slow increase of weak-grain in early ripening stage,loose spikelettype of H.vulgare.B₂—rapid senescence of weak-grain ia late ripening stage,dense spikelettype of H.vulgare.The above-mentioned charactersitics are shown not only under normalgrowing condition,but also at conditions such as spike-shading,leavescutting and cutting-off a part of spikes.It may be ascertained that thedistinctions embody the general idea in biology.3.When the condition is changed,the weak-grain of B type will showthe more adjustable capacity on the weight.更多还原