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Liana Ecology Project
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Studies on population structure of kudzu vines (Pueraria lobata Ohwi). V. Stem-length proportion of the overwintering stems classified by the number of vascular bundle rings and the proportion of the number of rooted nodes to non-rooted nodes in these stems
Journal Article
Tsugawa H; Kayama R
1980
Journal of the Japanese Society of Grassland Science
27
285-289
In this study the authors in order to make clear the population structure of kudzu vines examined the stem length proportion of the overwintering stems by the number of vascular bundle rings and the numeric proportion of rooted nodes to non-rooted nodes in these stems and obtained the following results: The total length of whole overwintering stems in a 200m^2 plot of the natural population of kudzu vines was 149 542.5cm and these overwintering stems consisted of one-ring to seven-ring stems (One-ring and seven-ring indicate the numbers of vascular bundle rings in the stems). The stem-length proportions of one-ring to seven-ring stems were 48.33 37.03 11.72 2.14 0.69 0.03 and 0.06% respectively. The stem lengths per 1m^2 were 361.4 276.9 87.7 16.0 5.2 0.2 and 0.4cm following the order of the one-to seven-ring stems (Table 1). The smaller stem-length proportion of stems with more than four rings would be attributed to the deaths of these stems caused by physiological deterioration injury due to the larvae of insects such as Endoclyta sp. and diseases due to Synchytrium minutima Fusarium sp. and so on. The numeric proportion of the rooted node was a minimum of 7.12% in the one-ring stem. This proportion increased to a maximum of 54.82% in the four-ring stem with an increasing number of rings in the stem (Table 2). These results would indicate that elder stems have more of a chance to come in contact with the soil surface and to produce the nodal root. The rooted nodes have a root system of R-I or R-II in the one-ring R-I to R-III in the two-ring and R-I to R-IV in the three to the five-ring stems (R-I R-II indicate the ranks of the root systems based on the number of vascular bundle rings at the base of the root. For detailed explanation see previous paper II). This fact suggests that on occasion the vascular bundle rings are formed earlier in the base of the root than in the internode of the stems.
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