Growth temperature influences the underlying components of relative growth rate: an investigation using inherently fast- and slow-growing plant species
Growth temperature influences the underlying components of relative growth rate: an investigation using inherently fast- and slow-growing plant species
复制标题
DOI：
10.1046/j.1365-3040.2002.00879.x
复制
发表时间：
2002-08-01
影响因子：
7.3
通讯作者：
Atkin, OK
中科院分区：
文献类型：
--
作者：
Loveys, BR;Scheurwater, I;Atkin, OK
我们研究了生长温度对一系列内在快速和缓慢生长的植物物种生长的基本组成部分的影响。植物在恒定的18、23和28 ℃下水培生长。对16种对比植物进行了生长分析，对16种植物中的6种进行了全植物气体交换。种间比叶面积（SLA）的变化是重要的，在确定的相对生长速率（RGR）的变化之间的物种在23和28 degreesC，但在18 degreesC的RGR的变化无关。当生长在18 ℃时，净同化率（NAR）变得比SLA更重要，解释RGR的变化。在整个拍摄光合作用和碳浓度的变化不能解释的重要性，NAR在确定RGR在较低的温度。相反，整株呼吸每单位叶面积适应不同的生长温度的程度的变化负责。生长在28摄氏度的植物比生长在18和23摄氏度的植物在呼吸中使用了更大比例的每日固定碳。它的结论是，生长的基本组成部分的相对重要性的影响，生长温度，呼吸驯化的程度是至关重要的更大的作用发挥NAR在确定RGR的变化，在下降的生长温度。
We examined the effect of growth temperature on the underlying components of growth in a range of inherently fast- and slow-growing plant species. Plants were grown hydroponically at constant 18, 23 and 28 degreesC. Growth analysis was conducted on 16 contrasting plant species, with whole plant gas exchange being performed on six of the 16 species. Inter-specific variations in specific leaf area (SLA) were important in determining variations in relative growth rate (RGR) amongst the species at 23 and 28 degreesC but were not related to variations in RGR at 18 degreesC. When grown at 18 degreesC, net assimilation rate (NAR) became more important than SLA for explaining variations in RGR. Variations in whole shoot photosynthesis and carbon concentration could not explain the importance of NAR in determining RGR at the lower temperatures. Rather, variations in the degree to which whole plant respiration per unit leaf area acclimated to the different growth temperatures were responsible. Plants grown at 28 degreesC used a greater proportion of their daily fixed carbon in respiration than did the 18 and 23 degreesC-grown plants. It is concluded that the relative importance of the underlying components of growth are influenced by growth temperature, and the degree of acclimation of respiration is of central importance to the greater role played by NAR in determining variations in RGR at declining growth temperatures.