Respiratory Efflux of Carbon Dioxide from Mature and Meristematic Tissue of Uniculm Barley During Eighty Hours of Continuous Darkness
Respiratory Efflux of Carbon Dioxide from Mature and Meristematic Tissue of Uniculm Barley During Eighty Hours of Continuous Darkness
复制标题
连续黑暗八十小时期间大麦成熟组织和分生组织二氧化碳的呼吸流出
DOI：
10.1093/oxfordjournals.aob.a086179
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发表时间：
1981
期刊：
影响因子：
4.2
通讯作者：
A. Parsons
中科院分区：
文献类型：
--
作者：
M. Robson;A. Parsons
将一枝大麦的幼苗单独种植在23/21 °C的生长室中的盆中，在每12小时的光周期期间，辐照度为655 µE m ² s ³。在第五叶期，他们进行了80小时的连续黑暗，在此期间的营养芽分生组织，和成熟的完全展开的叶子，分别监测CO 2流出率。分生组织的呼吸流出量最初很高，为12-15 mg CO·g·h·，相当于每天体重减轻20- 25%，在正常的黑暗时期，它保持很高，甚至略有上升，但随后急剧下降。即便如此，在实验期结束时，它仍然是成熟组织的三倍。成熟组织的CO2流出速率开始较低，并且在黑暗的前12小时期间进一步下降。然后，它稳定在2.0 - 2.5毫克CO·g-1·h-1
Young plants of uniculm barley were grown singly in pots in a growth room at 23/21 °C, and an irradiance of 655 µE m⁻² s⁻¹ during each 12 h photoperiod. At the fifth leaf stage, they were subjected to 80 h of continuous darkness during which the rates of CO₂ efflux of vegetative shoot meristems, and mature fully expanded leaves, were separately monitored. Respiratory efflux from the meristematic tissue was initially high, 12-15 mg CO₂g⁻¹ h⁻¹, equivalent to a daily loss in weight of 20-25 per cent. It remained high, or even rose slightly, during what would have been the normal dark period, but then fell sharply. Even so, it was still three times that of the mature tissue at the end of the experimental period. The rate of CO₂ efflux of the mature tissue began low, and fell even further during the first 12 h of darkness. It then levelled off at a rate of 2·0-2·5 mg CO₂ g⁻¹ h⁻¹, equivalent to a daily loss in weight of about 3 per cent. It is suggested that the rate of 'mature tissue' respiration, established after 12-24 h of darkness, might be a useful selection criterion to employ in attempts to increase the total dry matter yield of the grass crop by breeding.