Effects of root temperature on growth of four lines of subterranean clover

Abstract

One line of subterranean clover (CPI 14196) produced significantly more dry matter than three other lines (CPI 12621 — Israel, Dwalganup, and Mount Barker) at root temperatures suboptimal for shoot growth (10 and 15°C). These differences were associated with leaf area per plant and the size of individual leaves, and the greater growth was associated with partitioning of a greater part of the dry matter to leaves. The significance of the results is discussed in terms of limits to winter production of pastures based on subterranean clover.