Variation in the ureide content of Jack Bean during the reproductive stages in response to nitrate

Camargos, Liliane Santos de; Aguiar, Leandro Ferreira; Carmezini, José Antônio; Azevedo, Ricardo Antunes

doi:10.1590/s1516-89132009000300009

Cited by 2 publications

(1 citation statement)

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“…To date, yerba-mate producers, industries and even scientists have not paid much attention to plant/leaf sexual dimorphism. This species exhibits some other specialized strategies: it grows in soils with low pH (CaCl 2 ), even as low as 3.4 (Lourenço 1997); it does not respond positively to liming (Reissmann et al 1997), and exhibits higher net photosynthesis when NH 4 rather than NO 3 nitrogen is applied (Gaiad et al 2006)-a behavior exhibited by approximately only 5% species in the plant kingdom.…”

Section: Introductionmentioning

confidence: 99%

Time series in analysis of yerba-mate biennial growth modified by environment

Rakocevic

Martim

2010

Int J Biometeorol

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To assess differences in the lag-effect pattern in the relationship between yerba-mate biennial growth and environmental factors, a time-series analysis was performed. A generalized Poisson regression model was used to control time trends, temperature, growing degree days (GDD), rainfalls and night length (NL). It was hypothesized that the active growth and growth pauses in yerba-mate are controlled endogenously and modified by environment, and that genders would respond differently to environmental modifications. The patterns in the lag effect from the distributed-lag models were similar to those of time-series models with meteorological data means with lag = 0. GDD and NL were principal factors affecting biennial yerba-mate shoot elongation and the number of green leaves of females grown in monoculture, besides their significant effects on metamer emission and leaf area in males grown in monoculture. NL also had a significant influence on shoot elongation and leaf area of both genders grown in forest understorey (FUS), indicating that yerba-mate growth is synchronized by an internal clock sensitive to temperature adjustments. The morphological plasticity and the adaptation efforts of yerba-mate were more pronounced in monoculture than in FUS. Sexual dimorphism was expressed-males were more sensitive to environmental changes than females, especially in monoculture. Growth modifications were much more intense when plants were grown in a cultivation system that is less like yerba-mate natural habitat (monoculture) than in one resembling its natural habitat (FUS). Our data support the ecological specialization theory.

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Section: Introductionmentioning

confidence: 99%