On the definition of ecological species groups in tropical rain forests

Vegetatio, Journal Year: 1988, Volume and Issue: 75(1-2), P. 81 - 86

Published: May 1, 1988

Language: Английский

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Thermal time - concepts and utility

Annals of Applied Biology, Journal Year: 2005, Volume and Issue: 146(1), P. 1 - 14

Published: Jan. 1, 2005

This paper (i) reviews temperature/development rate relationships in plants and poikilothermic invertebrates, (ii) argues that the relationship is often linear over much of range up to thermal optimum (To) provides a possible mechanism, (iii) evidence trade-off between base temperature (Tb) constant (DD) enables each species adapt its environment, (iv) indicates some practical ecological implications. Where has been characterised it estimate for development (Tb, expressed °C) (DD, reciprocal coefficient (a), degree [°C] days accumulated above Tb). A basis proposed based on Arrhenius Sharpe-Schoolfield equations involving activation enthalpy progressive inactivation reactant molecules at both low high temperatures. Knowledge Tb DD rates organisms/processes be calculated compared any given To. An analysis published results differentiation processes (differentiation = change state) insects, Collembola, spiders, nematodes showed tended vary with niche which organism adapted, there was DD. Tropical had higher values than temperate decreased as increased (and vice versa). conferred competitive advantage environment adapted. The decrease relatively greater increase Tb, further favouring tropical species. mechanism suggested whereby were shown correlated (P < 0.01) (HA) an assumed, rate-limiting enzyme. Thermal time can also applied growth (= dry weight) when requirement maturity sum requirements growth. Rates greatly species, depending upon they inhabit, implications such differences resource are considered. In insects nematodes, but not annual plants, usually coupled Consequently, resources inadequate, mature size these animals varies less plants. provide insight into life strategies within their communities have

Language: Английский

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Seed priming with chitosan improves maize germination and seedling growth in relation to physiological changes under low temperature stress

Journal of Zhejiang University SCIENCE B, Journal Year: 2009, Volume and Issue: 10(6), P. 427 - 433

Published: May 27, 2009

Language: Английский

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Contributions of PCR-Based Methods to Plant Systematics and Evolutionary Biology

Springer eBooks, Journal Year: 1998, Volume and Issue: unknown, P. 43 - 86

Published: Jan. 1, 1998

Language: Английский

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Local seed systems and their importance for an improved seed supply in developing countries

Euphytica, Journal Year: 1994, Volume and Issue: 78(3), P. 207 - 216

Published: Jan. 1, 1994

Language: Английский

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Phylogeny and evolution of plant pathogenic oomycetes—a global overview

European Journal of Plant Pathology, Journal Year: 2014, Volume and Issue: 138(3), P. 431 - 447

Published: Jan. 5, 2014

Language: Английский

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Potassium: A Vital Regulator of Plant Responses and Tolerance to Abiotic Stresses

Published: Jan. 24, 2018

Among the plant nutrients potassium (K) is one of vital elements required for growth and physiology. Potassium not only a constituent structure but also plays regulatory function in several biochemical processes related to protein synthesis, carbohydrate metabolism, enzyme activation. There are physiological like stomatal regulation photosynthesis dependent on K. In recent decades K was found provide abiotic stress tolerance. Under salt stress, helps maintaining ion homeostasis osmotic balance. drought condition regulates opening makes plants adaptive water deficit. Many reports provided notion that enhances antioxidant defense therefore, protects from oxidative under various environmental adversities. Also, it provides some cellular signaling alone or association with other molecules phytohormones. Although considerable progress understanding K-induced tolerance has been achieved exact molecular mechanisms such protections still research. this review, we summarized literature biological functions K, its uptake, translocation role

Language: Английский

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Ascochyta blight of chickpea (Cicer arietinum L.): a review of biology, pathogenicity, and disease management

Australian Journal of Agricultural Research, Journal Year: 2005, Volume and Issue: 56(4), P. 317 - 317

Published: Jan. 1, 2005

Ascochyta blight (AB), caused by rabiei is a major disease of chickpea (Cicer arietinum L.), especially in areas where cool, cloudy, and humid weather persists during the crop season. Several epidemics AB causing complete yield loss have been reported. The fungus mainly survives between seasons through infected seed debris. Despite extensive pathological molecular studies, nature extent pathogenic variability A. not clearly established. Accumulation phenols, phytoalexins (medicarpin maackiain), hydrolytic enzymes has associated with host-plant resistance (HPR). Seed treatment foliar application fungicides are commonly recommended for management, but further information on biology survival needed to devise more effective management strategies. Recent studies inheritance indicate that several quantitative trait loci (QTLs) control resistance. In this paper we review rabiei, HPR, options, an emphasis future research priorities.

Language: Английский

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Seed dormancy and germination stimulation syndromes for Australian temperate species

Australian Journal of Botany, Journal Year: 2007, Volume and Issue: 55(3), P. 336 - 336

Published: Jan. 1, 2007

Understanding seed germination biology and the dynamics of dormancy is essential to developing reliable techniques. This paper presents some new data reviews recent findings from studies on Australian species, with respect role temperature moisture in control germination. A seed-burial experiment was conducted over a 1-year period (January–December) seeds Acanthocarpus preissii Lehm., Astroloma xerophyllum (DC.) Sond., Gahnia grandis (Labill.) S.T.Blake, Goodenia scaevolina F.Muell. Tersonia cyathiflora (Fenzl) J.W.Green determine fluctuations naturally experience buried environment. All became hydrated during autumn (March) while soil temperatures were >15°C, suggestive warm stratification before onset cooler winter appropriate for Evidence rapid wetting drying environment also present. Laboratory experiments testing as means loss showed that several weeks at 26/13°C or 33/18°C promoted Lomandra (Endl.) Ewart, Marianthus bicolor (Putt.) Xyris lanata R.Br. seeds. X. responded cold 5°C. By integrating this other published diagrammatic models timing, syndromes propagation strategies temperate species are presented working hypotheses help direct future research.

Language: Английский

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Impact of Forest Fragmentation on Seedling Abundance in a Tropical Rain Forest

Conservation Biology, Journal Year: 1998, Volume and Issue: 12(2), P. 380 - 389

Published: April 26, 1998

Language: Английский

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