Schmitt J M, Piepenbrock M
Institut für Pflanzenphysiologie und Mikrobiologie, Freie Universität, 1 Berlin 33, Germany.
Plant Physiol. 1992 Jun;99(2):759-61. doi: 10.1104/pp.99.2.759.
The abundance of mRNA specific for phosphoenolpyruvate carboxylase (PEPCase) was measured in leaves from well-watered plants of Mesembryanthemum crystallinum. Plants grown side by side in pots of four different volumes (0.16, 0.74, 2.6, 6.5 liters) were compared. The time of increase in the steady-state level of PEPCase mRNA in well-watered plants was dependent on soil volume. The larger the pot, the later PEPCase transcripts were increased. PEPCase mRNA induction started when shoot water content decreased to well below 4000% of dry weight. No positive correlation with the developmental status of the plants could be found. The data indicate that PEPCase mRNA induction in well-watered plants up to 10 weeks of age is controlled environmentally rather than developmentally.
对冰叶日中花水分充足的植株叶片中磷酸烯醇式丙酮酸羧化酶（PEPCase）特异性mRNA的丰度进行了测定。对并排种植在四种不同体积（0.16、0.74、2.6、6.5升）花盆中的植株进行了比较。水分充足的植株中PEPCase mRNA稳态水平升高的时间取决于土壤体积。花盆越大，PEPCase转录本增加得越晚。当地上部分含水量降至远低于干重的4000%时，PEPCase mRNA诱导开始。未发现与植株发育状态呈正相关。数据表明，在长达10周龄的水分充足的植株中，PEPCase mRNA的诱导受环境控制而非发育控制。
