Photosynthetic Responses to Phosphorus Nutrition in Eucalyptus grandis Seedlings

Kirschbaum, Miko U.F.; Tompkins, D.

doi:10.1071/pp9900527

Cited by 68 publications

(50 citation statements)

References 19 publications

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“…3B) (Medina 1984;Field 1988;Thompson et al 1992). Correlations between leaf P and A max have also been observed in other shade tolerant tropical forest species growing on soil low in P (Raaimakers et al 1995;Reich et al 1995), Eucalyptus grandis (Kirschbaum and Tompkins 1990) and Pinus radiata (Conroy et al 1988). The small response of A max to leaf N concentrations in the current study could be because P concentrations were limiting A max over all N concentrations, underscoring the importance of VAmycorrhizae for P nutrition and high rates of carbon gain in tropical tree species growing in soils low in P.…”

Section: Effect Of Va-mycorrhizae On Mineral Nutrition and A Maxmentioning

confidence: 72%

Symbiotic Vesicular-Arbuscular Mycorrhizae Influence Maximum Rates of Photosynthesis in Tropical Tree Seedlings Grown Under Elevated CO2

Lovelock¹,

Kyllo²,

Popp³

et al. 1997

Functional Plant Biol.

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Abstract.To investigate the importance of phosphorus and carbohydrate concentrations in influencing photosynthetic capacity of tropical forest tree seedlings under elevated CO 2 , we grew seedlings of Beilschmiedia pendula (Sw.) Hemsl. (Lauraceae) under elevated CO 2 concentrations either with or without vesicular-arbuscular (VA) mycorrhizae. VA-mycorrhizae increased phosphorus concentrations in all plant organs (leaves, stems and roots). Maximum rates of photosynthesis (A max ) measured under saturating levels of CO 2 and light were correlated with leaf phosphorus concentrations. VA-mycorrhizae also increased leaf carbohydrate concentrations, particularly under elevated CO 2 , but levels were low and within the range observed in naturally occurring forest species. Root carbohydrate concentrations were reduced in VA-mycorrhizal plants relative to non-mycorrhizal plants. These results indicate an important role for VA-mycorrhizae in controlling photosynthetic rates and sink strength in tropical trees, and thus in determining their response to future increases in atmospheric CO 2 concentrations.

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Section: Effect Of Va-mycorrhizae On Mineral Nutrition and A Maxmentioning

confidence: 72%

Symbiotic Vesicular-Arbuscular Mycorrhizae Influence Maximum Rates of Photosynthesis in Tropical Tree Seedlings Grown Under Elevated CO2

Lovelock¹,

Kyllo²,

Popp³

et al. 1997

Functional Plant Biol.

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“…The relative leafgrowth rate is one of the most sensitive parameters to phosphorus deficiency (Kirschbaum and Tompkins, 1990), and it affects the photosynthetic rate per unit area. A P-deficiencyinduced decline in leaf growth and photosynthetic rate may be ascribed to a reduction in stomatal conductance, RuP2 carboxylase regeneration capacity (Brooks, 1986).…”

Section: Introductionmentioning

confidence: 99%

The influence of phosphorus nutrition on the physiological response of moth bean genotypes to drought

Garg¹,

Burman

Kathju

2004

Z. Pflanzenernähr. Bodenk.

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SummaryFour genotypes of moth bean (Vigna aconitifolia Jacq. Marechal), including two early (RMO-257 and CZM-18) and two late flowering types (CAZRI moth-1 and Jawala) were grown at two levels of phosphorus (0 and 40 kg ha ±1 ) and subjected to drought by withholding of water until wilting at the pre-flowering stage in a pot trial. Drought significantly decreased plant water potential, relative water content, rate of net photosynthesis, contents of chlorophyll, starch, soluble protein, and nitrate reductase activity in all genotypes. The adverse effects of drought were less pronounced in early than in late flowering genotypes. Phosphorus application significantly ameliorated the negative effects of drought on above parameters, particularly in the late genotypes. We conclude that P addition to moth bean may be justified even in low-rainfall years because of its ability to improve yield under water-limited conditions.

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“…P addition enhanced ETR max because P is known to increase biochemical efficiency of the light reactions of photosynthesis and promote enhanced carbon assimilation rates (Kirschbaum andTompkins 1990, Raaimakers et al 1995). Previous studies at this site demonstrate unequivocally that multiple soil resources co-limit trees in deep shade and we extend these results to seedlings of lianas.…”

Section: P Limits Photosynthetic Performance But P and K Together Do Notmentioning

confidence: 99%

Lianas always outperform tree seedlings regardless of soil nutrients: results from a long‐term fertilization experiment

Pasquini

Wright

Santiago

2015

Ecology

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bstract. Lianas are a prominent growth form in tropical forests, and there is compelling evidence that they are increasing in abundance throughout the Neotropics. While recent evidence shows that soil resources limit tree growth even in deep shade, the degree to which soil resources limit lianas in forest understories, where they coexist with trees for decades, remains unknown. Regardless, the physiological underpinnings of soil resource limitation in deeply shaded tropical habitats remain largely unexplored for either trees or lianas. Theory predicts that lianas should be more limited by soil resources than trees because they occupy the quick-return end of the ''leaf economic spectrum,'' characterized by high rates of photosynthesis, high specific leaf area, short leaf life span, affinity to high-nutrient sites, and greater foliar nutrient concentrations. To address these issues, we asked whether soil resources (nitrogen, phosphorus, and potassium), alone or in combination, applied experimentally for more than a decade would cause significant changes in the morphology or physiology of tree and liana seedlings in a lowland tropical forest. We found evidence for the first time that phosphorus limits the photosynthetic performance of both trees and lianas in deeply shaded understory habitats. More importantly, lianas always showed significantly greater photosynthetic capacity, quenching, and saturating light levels compared to trees across all treatments. We found little evidence for nutrient 3 growth form interactions, indicating that lianas were not disproportionately favored in nutrient-rich habitats. Tree and liana seedlings differed markedly for six key morphological traits, demonstrating that architectural differences occurred very early in ontogeny prior to lianas finding a trellis (all seedlings were self-supporting). Overall, our results do not support nutrient loading as a mechanism of increasing liana abundance in the Neotropics. Rather, our finding that lianas always outperform trees, in terms of photosynthetic processes and under contrasting rates of resource supply of macronutrients, will allow lianas to increase in abundance if disturbance and tree turnover rates are increasing in Neotropical forests as has been suggested.

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Photosynthetic Responses to Phosphorus Nutrition in Eucalyptus grandis Seedlings

Cited by 68 publications

References 19 publications

Symbiotic Vesicular-Arbuscular Mycorrhizae Influence Maximum Rates of Photosynthesis in Tropical Tree Seedlings Grown Under Elevated CO2

Symbiotic Vesicular-Arbuscular Mycorrhizae Influence Maximum Rates of Photosynthesis in Tropical Tree Seedlings Grown Under Elevated CO2

The influence of phosphorus nutrition on the physiological response of moth bean genotypes to drought

Lianas always outperform tree seedlings regardless of soil nutrients: results from a long‐term fertilization experiment

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