Temperature effect on carbon partitioning in two commercial cultivars of sugarcane
Temperature effect on carbon partitioning in two commercial cultivars of sugarcane
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DOI：
10.1071/fp09216
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发表时间：
2010-01-01
影响因子：
3
通讯作者：
Albertson, Peter L.
中科院分区：
文献类型：
--
作者：
Grof, Christopher P. L.;Campbell, James A.;Albertson, Peter L.
温度对甘蔗植株生长和干物质分配的影响已经下定决心。两个商品甘蔗品种Q117和Q138的植株在恒温条件下生长72天，然后在14、18、22和26℃四个不同的环境温度下进行处理，然后在种植后85、120、155和190天(DAP)收获植株，进行生物量和糖的分配。在施加温度处理后，两个品种的茎长和节数的增长都是线性的，并且在不同的温度条件下存在显著差异。当以热时间(生长温度(摄氏度)x天数)描述数据时，无论植物生长的温度如何，单位热时间产生的节间数是相同的，并且节间数随总热输入的增加而线性增加。Q117和Q138的秸秆干物质积累在对数尺度上呈线性关系，且达极显著水平(P<；0.001)。Q117在14℃时的线性积累速率为1.39g/d(-1)到26℃时的5.31g/d(-1)，而Q138在14℃和26℃下的线性积累速率分别为2.24g/d(-1)和4.39g/d(-1)。总蔗糖积累规律也遵循指数趋势，在155DAP之前差异不明显，两个品种的蔗糖积累速率都随着温度的升高而增加。然而，Q117在14至26摄氏度之间的升幅更大。不同品种的蔗糖/己糖比值也不同。这种差异在生长在14摄氏度和18摄氏度的植物中最为明显，在这些植物中，Q117中的蔗糖/己糖比是Q138中测得的两倍。甘蔗营养单位的生产明显是积累度日数的函数，并受品种的影响。节间伸长受温度和品种互作的影响，但不是度日数的函数。
The effect of temperature upon plant growth and partitioning of dry matter in sugarcane (Saccharum spp.) was determined. Sugarcane plants of two commercial cultivars, Q117 and Q138 were grown under constant conditions for 72 days then subjected to one of four different ambient temperature regimes, 14, 18, 22 or 26 degrees C. Plants were harvested before the imposition of the treatments, then at 85, 120, 155 and 190 days after planting (DAP) for biomass and sugar partitioning. Following the imposition of temperature treatments, the increase in stalk length and node number was linear and notably different between the temperature regimes for both cultivars. When the data was described in terms of thermal time (growth temperature (degrees C) x number of days), the number of internodes produced per unit of thermal time was the same irrespective of the temperature in which the plants were grown and internode number increased in a linear manner with an increase in total thermal input. Stalk dry matter accumulation over time was linear at the log-scale and highly significant, (P < 0.001) for both Q117 and Q138. The linear rate of accumulation increased with temperature ranging from 1.39 g day(-1) at 14 degrees C to 5.31 g day(-1) at 26 degrees C for Q117, whereas in Q138 it ranged from 2.24 g day(-1) to 4.39 g day(-1) at temperatures of 14 and 26 degrees C, respectively. The pattern of total sucrose accumulation also followed an exponential trend, with little difference evident until 155 DAP where rates increased with temperature for both varieties. However, the increase between 14 and 26 degrees C was more profound for Q117. The sucrose/hexose ratio also differed between the cultivars. This difference was most pronounced in plants grown at both 14 and 18 degrees C where the ratio of sucrose/hexose in Q117 was double that measured in Q138. The production of phytomeric units in sugarcane is clearly a function of accumulated degree-days and influenced by cultivar. The elongation of internodes is influenced by temperature and varietal interaction but is not a function of degree-days.