Influence of plant maturity, shoot reproduction and sex on vegetative growth in the dioecious plant Urtica dioica

Onate Gutierrez, Marta and Munne-Bosch, Sergi (2009) Influence of plant maturity, shoot reproduction and sex on vegetative growth in the dioecious plant Urtica dioica. Annals of Botany, 104 (5). pp. 945-956. ISSN 0305-7364

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Abstract

BACKGROUND AND AIMS: Stinging nettle (Urtica dioica) is a herbaceous, dioecious perennial that is widely distributed around the world, reproduces both sexually and asexually, and is characterized by rapid growth. This work was aimed at evaluating the effects of plant maturity, shoot reproduction and sex on the growth of leaves and shoots. METHODS: Growth rates of apical shoots, together with foliar levels of phytohormones (cytokinins, auxins, absicisic acid, jasmonic acid and salicylic acid) and other indicators of leaf physiology (water contents, photosynthetic pigments, alpha-tocopherol and F(v)/F(m) ratios) were measured in juvenile and mature plants, with a distinction made between reproductive and non-reproductive shoots in both males and females. Vegetative growth rates were not only evaluated in field-grown plants, but also in cuttings obtained from these plants. All measurements were performed during an active vegetative growth phase in autumn, a few months after mature plants reproduced during spring and summer. KEY RESULTS: Vegetative growth rates in mature plants were drastically reduced compared with juvenile ones (48 % and 78 % for number of leaves and leaf biomass produced per day, respectively), which was associated with a loss of photosynthetic pigments (up to 24 % and 48 % for chlorophylls and carotenoids, respectively) and increases of alpha-tocopherol (up to 2.7-fold), while endogenous levels of phytohormones did not differ between mature and juvenile plants. Reductions in vegetative growth were particularly evident in reproductive shoots of mature plants, and occurred similarly in both males and females. CONCLUSIONS: It is concluded that (a) plant maturity reduces vegetative growth in U. dioica, (b) effects of plant maturity are evident both in reproductive and non-reproductive shoots, but particularly in the former, and (c) these changes occur similarly in both male and female plants.

Item Type:
Journal Article
Journal or Publication Title:
Annals of Botany
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1100/1110
Subjects:
ID Code:
80218
Deposited By:
Deposited On:
27 Jun 2016 12:10
Refereed?:
Yes
Published?:
Published
Last Modified:
23 Jan 2020 03:20