Phyllotaxis diversity in Lycopodium clavatum L and Lycopodium annotinum L.
Phyllotaxis diversity in Lycopodium clavatum L and Lycopodium annotinum L.
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DOI：
10.5586/asbp.1996.036
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发表时间：
1996-01-01
影响因子：
1
通讯作者：
Gola, E
中科院分区：
文献类型：
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作者：
Gola, E
在小叶石蒜的芽部中，叶状性是非常多样的。在各向异性的clavarum中发现了24种不同的模式，而在等同性的L. annotinum中“只有”11种。寄生数为k:（k+1）的螺旋型与典型的k:k型同时存在。两种植物中，斜向各向异性枝条的k数均高于正向各向异性。在棒草中也比在花草中含量高。第一种层状分型谱较宽，多种模式出现的频率几乎相同，而窄层分型谱仅以一种模式明显占优势。这种模式在其他植物中最常见，如斐波那契或卢卡斯，但在研究的石松属物种中并不常见。不连续的层状转变通常发生在茎上的两个位置：二分分支下方或边界上方，分隔了轴的年增量。在超过7%的发育独立的茎节中，过渡是中等频率发生的。二分枝导致的枝径变化、生长的季节性波动以及相对于茎周的小叶状结构的小尺寸被认为是导致所研究物种具有高枝状结构多样性的主要因素。
In shoots of Lycopodium microphyllous phyllotaxis is extremely diverse. 24 various patterns were found in anisotomous L. clavarum and ''only'' 11 in isotomous L. annotinum. Spiral patterns expressed by k:(k+1) parastichy numbers were present together with typically whorled k:k patterns. In both species k number was higher in plagiotropic shoots than in orthotropic. It was also higher in L. clavatum than in L. annotinum. In the first species phyllotactic spectrum was wider with many patterns almost equally frequent, whereas narrow spectrum of L. annotinum showed clear dominance of only one pattern. The patterns, which are the most frequent in other plants, such as Fibonacci or Lucas, were uncommon in studied Lycopodium species. Discontinuous phyllotactic transitions occurred typically in two locations on the shoot: just below the dichotomic branching or above the borders, that separate the annual increments of the axis. Transitions were moderately frequent occurring in more than 7% of developmentally independent shoot segments. Dichotomous branching, resulting in variable shoot diameter, seasonal fluctuations of growth as well as a small size of microphylls relative to the shoot circumference are proposed to be the main factors contributing to the high phyllotactic diversity in studied species.