Biosystematic Studies on Adenophora potaninii Korsh. Complex (Campanulaceae). Ⅰ. Phenotypic Plasticity

Abstract

Abstract:

Phenotypic plasticity is the environmental modification of genotypic expression

and an important means by which individual plants respond to environmental heterogeneity.

The study of phenotypic plasticity in the genus Adenophora, which is very complicated taxo-

nomically because of great morphological variation, proves to be helpful in both investigating

the phenotypic variation so as to evaluate potential taxonomic value of their characters and

providing important sources of information on the variation, adaptation and evolution of the

genus. Twenty-three populations representing all the six species in Adenophora potaninii

complex were transplanted into the garden. Of them six populations were selected for study-

ing their performance in the field and in the garden, in addition to cultivation experiment

under different treatments. The results show that there exists considerable developmental

plasticity in some leaf, floral and capsule characters. In particular, the leaf shape and length

of calyx lobe display significant developmental variation with the maximum being three times

as great as the minimum, which is noteworthy because they were previously considered as

diagnostic. The characters of root, caudex, stem and inflorescence are found to be very

plastic, especially the root diameter, the number of stems, stem height and inflorescence

length with great environmental plasticity. In addition, the populations from different habi-

tats show distinct amounts of plasticity. On the contrary, the characters of leaf, floral, cap-

sule and seed are less influenced by environments. It seems that the considerable variation in

the characters of leaf is attributed mainly to genetic differences. Finally, the phenotypic

plasticity of morphological characters of A. potaninii complex and its taxonomic significance

is discussed.

Key words: Phenotypic plasticity, Adenophora potaninii complex, Morphological characters, Variation

Ge Song, Hong De-yuan. Biosystematic Studies on Adenophora potaninii Korsh. Complex (Campanulaceae). Ⅰ. Phenotypic Plasticity[J]. .

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Biosystematic Studies on Adenophora potaninii Korsh. Complex (Campanulaceae). Ⅰ. Phenotypic Plasticity

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