scispace - formally typeset
Search or ask a question
Author

D. R. Simpson

Bio: D. R. Simpson is an academic researcher. The author has an hindex of 1, co-authored 1 publications receiving 62 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: Moderate day/night temperatures (20/15° v. 15/10°C) increased vegetative growth and reduced flowering in the seven litchi cvs Tai So, Bengal, Souey Tung, Kwai May Pink, Kwae May Red, Salathiel and Wai Chee.
Abstract: SummaryModerate day/night temperatures (20/15° v. 15/10°C) increased vegetative growth and reduced flowering in the seven litchi cvs Tai So, Bengal, Souey Tung, Kwai May Pink, Kwai May Red, Salathiel and Wai Chee. At higher temperatures (25/20° and 30/25°C), vegetative growth was promoted further and flowering eliminated. Temperature also influenced the type of inflorescence formed. More leaves were formed on the panicles of trees growing at 20/15° than at 15/10°C. All terminal shoots on all cultivars produced panicles at 15/10°C. The relative order for the amount of flowering at 20/15°C was: ‘Wai Chee’>‘Salathiel’>‘Kwai May Pink’>‘Tai So’>‘Bengal’>‘Souey Tung’>‘Kwai May Red’. Cultivars which were vigorous at high temperatures produced fewer panicles at 20/15°C and fewer leafless panicles at 15/10°C. Only small differences were observed in the leaf water potential and the nutrient status of the shoots at different temperatures. Vigour and flowering of the cultivars in the glasshouse generally reflected fi...

67 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: The separate and combined effects of temperature and water supply on floral induction were investigated in ‘Hass’ avocado, ‘Lisbon’ lemon and ‘Wai Chee’ litchi and “Sensation” mango plants.
Abstract: SummaryFloral induction in tropical trees generally follows a check in vegetative growth. However, it is not easy to identify the environmental factors involved in flowering, which normally occurs during the dry season when temperatures are also often lower. The separate and combined effects of temperature and water supply on floral induction were investigated in ‘Hass’ avocado (Persea americana), ‘Lisbon’ lemon (Citrus limon). ‘Wai Chee’ litchi (Litchi chinensis) and ‘Sensation’ mango (Mangifera indica). Low temperatures (15°/10°C or 15°/10°C and 20°/15°C compared with 30°/25°C and 25°/20°C) generally decreased vegetative growth and induced flowering in well-watered avocado, litchi and mango. A pre-dawn leaf water potential (ψL) of −1.7 to −3.5 MPa compared with −0.4 to −0.7 MPa in control avocado and litchi, and a pre-dawn relative water content (R.W.C.) of 90-93% compared with 97% or above in control mango plants also reduced or eliminated vegetative growth, but did not induce flowering. Low temperatur...

118 citations

BookDOI
01 Jan 2016
TL;DR: The crop-environment interaction in horticultural crops is receiving increased attention in the context of changing climatic conditions, and the most recent findings about the effects of the main abiotic environmental factors (water, temperature, salinity) on whole plant physiology of horticulture crops are presented.
Abstract: The crop-environment interaction in horticultural crops is receiving increased attention in the context of changing climatic conditions. Environmental stresses can cause morpho-anatomical, physiological and biochemical changes in crops, resulting in a strong profit reduction. A clear understanding of environmental factors and their interaction with physiological processes is extremely important for improving horticultural practices. Drought, excess moisture, salinity and heat stress are amongst the most important environmental factors influencing crop growth, development and yield processes. A comprehensive understanding of the impact of these stress factors will be critical in evaluating the impact of climate change and climate variability on horticultural crop production. Environmental stresses influence an array of processes including physiology, growth, development, yield and quality of crop. A clear understanding of environmental factors and their interaction with physiological processes is extremely important for improving horticultural practices. This review presents the most recent findings about the effects of the main abiotic environmental factors (water, temperature, salinity) on whole plant physiology of horticultural crops.

91 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of relative humidity (RH) and temperature on CO2 assimilation (An), stomatal conductance (Sc), transpiration rate (Tr), chlorophyll content, fresh and dry weight, leaf length, leaf area, leaf width, formation of new root and survival rate have been assayed in Doritaenopsis in growth chamber after 1 month of acclimatization.

79 citations

Journal ArticleDOI
TL;DR: Ten mango cultivars of tropical and subtropical origin were grafted onto cv.
Abstract: SummaryTen mango cultivars of tropical and subtropical origin (Carabao, Kensington, Nam Dok Mai, Alphonso, Dashehari, Florigon, Glenn, Irwin, Haden and Sensation) were grafted onto cv. Kensington seedling rootstock and held at four day/night temperatures for 20 weeks (15/10°C, 20/15°C, 25/20°C and 30/25°C). Vegetative growth increased with increasing temperatures. All grew vegetatively at 25/20°C and 30/25°C. Cultivars which did not grow at 20/15°C were Carabao, Kensington and Dashehari. Cultivars Kensington, Nam Dok Mai, Alphonso, Florigon, Glenn, Irwin, Haden and Sensation produced flower panicles at 15/10°C. The rise in temperature increased the average number of growth flushes (in responsive cultivars) from 0.48 at 15/10°C to 3.21 at 30/25°C, and the number of leaves per growth flush (1.22 at 15/10°C to 13.63 at 30/25°C). Distribution of dry matter from new growth was mostly to the roots at the lowest temperature (95% at 15/10°C) and to the leaves (58%) at 30/25°C. The mean daily temperature for zero ...

68 citations