Wiemken-Gehrig V, Wiemken A, Matile P
Institut für Allgemeine Botanik der ETH Zürich, Universitätsstraße 2, CH-8006, Zürich, Switzerland.
Planta. 1974 Dec;115(4):297-307. doi: 10.1007/BF00388612.
In Ipomoea tricolor senescence of the corolla is characterized by a decrease of hemicellulose and cellulose contents by 43% and 40%, respectively. Concomitant with the mobilization of cell wall polysaccharides the activities of various glycosidases, β-glucosidase, β-galactosidase, laminarinase, and cellobiase increase considerably. In contrast, the increase of α-mannosidase activity is less marked and the activity of β-xylosidase reaches its maximum in the course of extension growth of the flower bud. The partial degradation of the cell walls followed by the withdrawal of sugars as well as the mobilization of intracellular compounds may be meaningful with regard to the capacity of Ipomoea to form an enormous number of flowers consecutively.
在三色牵牛中，花冠衰老的特征是半纤维素和纤维素含量分别降低43%和40%。伴随着细胞壁多糖的动员，各种糖苷酶，如β-葡萄糖苷酶、β-半乳糖苷酶、海带多糖酶和纤维二糖酶的活性显著增加。相比之下，α-甘露糖苷酶活性的增加不太明显，β-木糖苷酶的活性在花芽伸长生长过程中达到最大值。细胞壁的部分降解，随后糖的撤离以及细胞内化合物的动员，对于三色牵牛连续形成大量花朵的能力可能具有重要意义。
