Response of physiological integration in Trifolium repens to heterogeneity of UV-B radiation

Li, Qian; Liu, Xiao; Yue, Ming; Tang, Wei‐Guo; Meng, Qingwei

doi:10.1016/j.flora.2010.11.013

Cited by 15 publications

(13 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Recent studies predict further increase of ultraviolet irradiance in the future [1], [2]. Several studies relative to the impact of enhanced UV-B radiation on plant physiology, morphology, growth, and development have been conducted [3], [4], [5], [6], [7], [8]. The immediate effects of increased UV-B in biotic interactions among plant individuals have great potential consequences [9], [10].…”

Section: Introductionmentioning

confidence: 99%

Effects of Ultraviolet-B Irradiance on Intraspecific Competition and Facilitation of Plants: Self-Thinning, Size Inequality, and Phenotypic Plasticity

Zhang

Yue

et al. 2012

PLoS ONE

Self Cite

View full text Add to dashboard Cite

(1) The effects of facilitation on the structure and dynamics of plant populations have not been studied so widely as competition. The UV-B radiation, as a typical environmental factor causing stress, may result in direct stress and facilitation. (2) The effects of UV-B radiation on intraspecific competition and facilitation were investigated based on the following three predictions on self-thinning, size inequality, and phenotypic plasticity: i) Self-thinning is the reduction in density that results from the increase in the mean biomass of individuals in crowded populations, and is driven by competition. In this study, the mortality rate of the population is predicted to decrease from UV-B irradiance. ii) The size inequality of a population increases with competition intensity because larger individuals receive a disproportionate share of resources, thereby leaving limited resources for smaller individuals. The second hypothesis assumes that direct stress decreases the size inequality of the population. iii) Phenotypic plasticity is the ability to alter one’s morphology in response to environmental changes. The third hypothesis assumes that certain morphological indices can change among the trade-offs between competition, facilitation, and stress. These predictions were tested by conducting a field pot experiment using mung beans, and were supported by the following results: (3) UV-B radiation increased the survival rate of the population at the end of self-thinning. However, this result was mainly due to direct stress rather than facilitation. (4) Just as competitor, facilitation was also asymmetric. It increased the size inequality of populations during self-thinning, whereas stress decreased the size inequality. (5) Direct stress and facilitation influence plants differently on various scales. Stress inhibited plant growth, whereas facilitation showed the opposite on an individual scale. Stress increased survival rate, whereas facilitation increased individual variability on the population scale. (6) Trade-offs between competitions, facilitation, and direct stress varied in different growing stages.

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of Ultraviolet-B Irradiance on Intraspecific Competition and Facilitation of Plants: Self-Thinning, Size Inequality, and Phenotypic Plasticity

Zhang

Yue

et al. 2012

PLoS ONE

Self Cite

View full text Add to dashboard Cite

show abstract

“…To countermine the heterogeneous UV-B radiation in microscale, it might be important for clonal plants to acclimate to this stressful environment by a well regulated physiological integration. We have found the intensity of physiological integration of T. repens L. for N and water resources decreased under heterogeneous UV-B radiation in favor of the stressed ramets and UV-B stressed ramets benefited from unstressed ramets by physiological integration (changes in physiological parameters) (Li et al 2011). However, there have been no studies of photosynthetic integration in clonal plants growing under heterogeneous UV-B radiation.…”

Section: ---mentioning

confidence: 83%

Effects of physiological integration on photosynthetic efficiency of Trifolium repens in response to heterogeneous UV-B radiation

Li¹,

Liu²,

Yue³

et al. 2011

Photosynt.

View full text Add to dashboard Cite

Several studies have found the photosynthetic integration in clonal plants to response to resource heterogeneity, while little is known how it responses to heterogeneity of UV-B radiation. In this study, the effects of heterogeneous UV-B radiation (280-315 nm) on gas exchange and chlorophyll fluorescence of a clonal plant Trifolium repens were evaluated. Pairs of connected and severed ramets of the stoloniferous herb T. repens were grown under the homogeneity (both of ramets received only natural background radiation, ca. 0.6 kJ m -2 d -1 ) and heterogeneity of UV-B radiation (one of the ramet received only natural background radiation and the other was exposed to supplemental UV-B radiation, 2.54 kJ m -2 d -1 ) for seven days. Stomatal conductance (g s ), intercellular CO 2 concentration (C i ) and transpiration rate (E) showed no significant differences in connected and severed ramets under homogenous and heterogeneous UV-B radiation, however, net photosynthetic rate (P N ) and maximum photosynthetic rate (P max ) of ramets suffered from supplemental increased UV-B radiation and that of its connected sister ramet decreased significantly. Moreover, additive UV-B radiation resulted in a notable decrease of the minimal fluorescence of dark-adapted state (F o ), the electron transport rate (ETR) and photochemical quenching coefficient (q P ) and an increase of nonphotochemical quenching (NPQ) under supplemental UV-B radiation, while physiological connection reverse the results. In all, UV-B stressed ramets could benefit from unstressed ramets by physiological integration in photosynthetic efficiency, and clonal plants are able to optimize the efficiency to maintain their presence in less favourable sites.

show abstract

“…Así, cambios en el contenido de clorofila inducidos por la radiación UV-B han sido reportados en numerosos trabajos llevados a cabo en condiciones controladas (invernadero) y no controladas (a campo) (Smith et al, 2000;Kakani et al, 2003;Li et al, 2011). En consonancia con estos reportes, en el presente trabajo también se observaron cambios en los niveles de Cl a, Cl b y Cl (a+b) inducidos por la radiación UV-B.…”

Section: Discussionunclassified

Efectos de la radiación ultravioleta B (UV-B) sobre diferentes variedades de Quinoa: II.- efectos sobre la síntesis de pigmentos fotosintéticos, protectores y azúcares solubles en condiciones controladas.

Prado

Pérez

González

2016

Bol. Soc. Argent. Bot.

View full text Add to dashboard Cite

Resumen: Se describen los efectos de la UV-B sobre la síntesis de pigmentos fotosintéticos (clorofila total, clorofila a, clorofila b, carotenoides), protectores (compuestos absorbentes de UV-B) y azúcares solubles (glucosa, fructosa y sacarosa) en cinco variedades de quinoa de diferentes orígenes geográficos. En general, se demuestra que las variedades reaccionan desplegando diferentes estrategias para protegerse de la radiación UV-B. Estas estrategias pueden ser de tipo morfológico, fisiológico y/o bioquímico. Una respuesta común, observada en las cinco variedades fue el incremento en el contenido de compuestos absorbentes de UV-B, lo que puede interpretarse como un "escudo químico" de protección para el aparato fotosintético frente al exceso de energía proveniente de la radiación que se aplica a las plantas.Palabras clave: Radiación UV-B, pigmentos fotosintéticos y protectores, azúcares solubles, adaptaciones, quinoa. Summary: Effects of B ultraviolet radiation (UV-B) on different varieties of Quinoa. II. Effects on thesynthesis of photosynthetic and protective pigments and soluble sugars under controlled conditions. The effects of UV-B radiation on photosynthetic (total chlorophyll, chlorophyll a, chlorophyll b and carotenoids) and protective (UV-B absorbing compounds) pigments, and soluble sugars (glucose, fructose and sucrose) in five quinoa varieties from different geographic origin are described. In general, it was demonstrated that varieties react by displaying different strategies to protect themselves against UV-B radiation. These strategies can be either morphological, physiological and/or biochemical type. A common response observed in the five varieties was the increase of UV-B absorbing compound content, which can be assumed as a protection, as a "chemical shield" to protect photosynthetic apparatus against the excess of energy that came from the radiation applied on plants.

show abstract

Response of physiological integration in Trifolium repens to heterogeneity of UV-B radiation

Cited by 15 publications

References 67 publications

Effects of Ultraviolet-B Irradiance on Intraspecific Competition and Facilitation of Plants: Self-Thinning, Size Inequality, and Phenotypic Plasticity

Effects of Ultraviolet-B Irradiance on Intraspecific Competition and Facilitation of Plants: Self-Thinning, Size Inequality, and Phenotypic Plasticity

Effects of physiological integration on photosynthetic efficiency of Trifolium repens in response to heterogeneous UV-B radiation

Efectos de la radiación ultravioleta B (UV-B) sobre diferentes variedades de Quinoa: II.- efectos sobre la síntesis de pigmentos fotosintéticos, protectores y azúcares solubles en condiciones controladas.

Contact Info

Product

Resources

About