THE INFLUENCE OF GROWING TEMPERATURE ON THE GROWTH AND MORPHOLOGY OF CEREAL SEEDLING ROOT SYSTEMS
THE INFLUENCE OF GROWING TEMPERATURE ON THE GROWTH AND MORPHOLOGY OF CEREAL SEEDLING ROOT SYSTEMS
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DOI：
10.1093/jxb/34.12.1720
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发表时间：
1983-01-01
影响因子：
6.9
通讯作者：
HAY, RKM
中科院分区：
文献类型：
--
作者：
ABBASALANI, MK;HAY, RKM
谷物幼苗（小麦、黑麦、大麦、燕麦[分别为小麦、黑麦、大麦和燕麦]）的根系，在 5、15 和 25 摄氏度的一系列液体和固体培养基中生长。 C，在播种和出苗之间的间隔进行测量（芽长4.0厘米）。在所有情况下，精轴的长度随时间线性增加，根伸长率每增加10度显着增加。 C 生长温度的增量。一般来说，固体培养基的延伸率低于水培养；然而，介质和生长温度之间存在强烈的相互作用，这表明较高的温度可以补偿机械阻抗的不利影响。由于观察到，对于所有 4 个物种，顶根直径与根长呈反比关系，因此无法检验生长温度对根轴直径的影响。仅当根的长度相同（但年龄不同）时，在不同温度下生长的根的直径比较才有效。遵循这个原理，人们发现，虽然谷物根部在5℃下生长。 C 往往比 15°C 时的厚度稍厚。 C 或 25 度。 C，这种影响很小，很少超过10%。已发表的关于不同生长温度下根直径差异很大的报告经过检查后发现通常不可靠。在所研究的任何处理中，侧根并不代表根系的重要部分。通过绘制每个样品的根系长度与芽长度的关系图来检查不同生长温度下的根：芽关系。对于相同的芽长度，根系在 5° 处。 C 比 25°C 时短得多。 C，15℃时的响应。 C 的变化更大。这一发现表明，在低温下生长的植物比在实验室温度下生长的植物吸收水分和溶质的能力更低，对实验室实验的设计具有重要意义。只有当根在整个生长过程中都暴露在实验温度下时，才能明确地确定根区温度对根生长和生理的影响。
The root systems of cereal seedlings (wheat, rye, barley, oats [Triticum aestivum, Secale cereale, Hordeum sativum and Avena sativa, respectively]), grown in a series of liquid and solid media at 5, 15 and 25.degree. C, were measured at intervals between sowing and emergence (shoot length 4.0 cm). In all cases, the length of seminal axes increased linearly with time, and the rate of root extension was increased significantly by each 10.degree. C increment in growing temperature. In general, extension rates were lower in the solid media than in water culture; however, there was a strong interaction between medium and growing temperature, indicating that higher temperatures can compensate party for the detrimental effects of mechanical impedance. Examination of the influence of growing temperature upon root axis diameter was hampered by the observation that, for all 4 spp., apical root diameter was inversely related to root length. Comparison of the diameters of roots grown at different temperatures was valid only if the roots were of the same length (but different ages). Following this principle, it was found that, although cereal roots grown at 5.degree. C tended to be slightly thicker than those at 15.degree. C or 25.degree. C, this effect was small and rarely exceeded 10%. Published reports of very large differences in root diameter at different growing temperatures were examined and found to be generally unreliable. Lateral roots did not represent a significant fraction of the root system in any of the treatments studied. Root:shoot relationships at different growing temperatures were examined by plotting root system length against shoot length for each sample. For the same shoot length, the root systems at 5.degree. C were much shorter than at 25.degree. C, the response at 15.degree. C being more variable. This finding, which indicates that plants grown at low temperatures have a lower capacity for water and solute uptake than those grown at laboratory temperatures, has important implications for the design of laboratory experiments. The influence of root zone temperature upon root growth and physiology can be determined unequivocably only if the roots have been exposed to the experimental temperature throughout their growth.