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Comparison of chlorophyll fluorescence with several other techniques used to assess chilling sensitivity in plants (1986)

MacRae, E. A. ; Hardacre, A. K. ; Ferguson, I. B.

Oxford, UK : Blackwell Publishing Ltd

Physiologia plantarum 67 (1986), S. 0

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ISSN: 1399-3054

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: Chilling tolerance in eight taxa was estimated from field and controlled environment observations and compared to tolerance estimated using a variety of techniques. The controlled environment observations suggested that the eight taxa could be ranked from chilling tolerant to chilling sensitive in the order: pea (Pisum sativum L. cv. Greenfeast), Passiflora edulis Sims., Passiflora ligularis Juss. and Passiflora quadrangularis L., pepino (Solanum muricatum L.) cultivars Comeraya, Suma, Miski, and mungbean [Vigna radiata (L.) R. Wilcz]; although the relationship between the passionfruit as a group and the pepinos was unclear.The change in the variable component of chlorophyll fluorescence (FR) with time near 0°C in darkness was the most reliable method of ranking the plants according to relative chilling tolerance. It was also sufficiently sensitive to discriminate clearly between the closely related pepino cultivars. The Passiflora species and pea were not susceptible to short term reductions in FR, with or without a 20 min exposure to light. Exposure to light at temperatures near 0°C emphasised the reductions in FR in the more sensitive species. Pea was the only species capable of recovering a measurable FR after a 60 min exposure to white light.Measurement of electrolyte leakage and ethylene evolution from leaf disks after a low temperature treatment could allow discrimination between closely related varieties, but not between genera. Catalase activity was reduced in all taxa in response to low temperature. However, both initial catalase levels and relative response to dark treatment at 20°C enabled the ranking of plants within the closely related subgroups according to susceptibility to chill injury.No one method clearly distinguished chilling sensitivity over all taxa.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1399-3054.1986.tb05074.x

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Testcross performance of maize lines from backcross populations containing highland Mexican or highland Peruvian germplasm (1989)

Eagles, H. A. ; Hardacre, A. K. ; Bansal, R. K.

Springer

Euphytica 41 (1989), S. 263-272

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ISSN: 1573-5060

Keywords: Zea mays ; maize ; backcrossing ; exotic germplasm ; highland tropical germplasm ; genetic recombination ; testcrossing ; grain yield ; grain moisture

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Summary Backcross populations of maize (Zea mays L.) were produced by crossing the early maturing inbred line W153R with the highland Mexican race Cónico then backcrossing to W153R (Q1 population) and by crossing W153R with the highland Peruvian race San Gerónimo then backcrossing to W153R (Q3 population). The populations were recombined by one generation of random mating. Testcrosses were produced from S0 plants in the original and recombined versions and these were evaluated in New Zealand for grain yield, grain moisture and other traits. Unexpected changes occurred during recombination for increased grain yield in the Q1 population and for decreased grain moisture in the Q3 population. This indicates strong, unplanned selection. Many testcrosses were higher yielding than check hybrids of W153R, but most were later maturing. S1 lines selected for high grain yield and acceptable grain moisture in testcrosses were advanced to the S2 generation and re-tested. All produced testcrosses with lower grain moisture than late maturing hybrid checks. Testcross grain yields of one Q1 line were equivalent to those of late maturing checks and its testcross had a lower grain moisture. The high yield potential of hybrids of this line was confirmed in the S4 generation.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00021593

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