Photothermal Responses of Flowering in Rice (Oryza sativa)

Summerfield, R. J.; Collinson, Sarah; Ellis, R. H.; Roberts, Ε. H.; Vries, F.W.T. Penning de

doi:10.1093/oxfordjournals.aob.a088314

Cited by 81 publications

(29 citation statements)

References 10 publications

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“…Our data show that the thermal time for the same cultivar varied among different environments, and similar results were observed in other studies [36,37]. Yin et al [38] re-analysed the reported data and concluded that the nonlinear relation between development rate and temperature, and the effect of the temperature amplitude may explain large part of the variation among environments.…”

Section: Genetic Adaptation For Yield Responses To Environmentsupporting

confidence: 90%

Adaptation and performance of rice genotypes in tropical and subtropical environments

Jing

Spiertz

Hengsdijk

et al. 2010

NJAS: Wageningen Journal of Life Sciences

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a b s t r a c tStandardized field experiments were carried out to study the performance of five rice genotypes derived from different germplasm in terms of yield, harvest index (HI) and grain quality at eight agro-ecological sites of the tropics and subtropics across Asia during 2001 and 2002. Considering that indica and javanica genotypes adapt to warm climatic conditions, and japonica genotypes to cool agro-climatic conditions, it is hypothesized that indica × japonica hybrids may combine high yields and good quality traits under a wide range of agro-climatic conditions. Grain yield, HI, protein content and amylose content varied considerably among genotypes and environments. Mean rice yields of genotypes ranged from 1.5 to 11 t ha −1 across the eight sites; on average yields were 7.2 t ha −1 under subtropical and 2.7 t ha −1 under tropical conditions. The much lower yields in tropical environments resulted from a low biomass as well as a low HI. Among the genotypes, the indica × japonica hybrid showed the highest yield under subtropical conditions, and a higher yield than the japonica genotypes and the indica × javanica hybrid but lower than the indica genotype under tropical conditions. Phenology of genotypes varied strongly across environments. Low yields at tropical locations were associated with a low light capture due to short growth duration. Post-anthesis light-use efficiencies and the photothermal quotient explained much of the variation in yield. Protein content varied among genotypes depending on location and year. Variation in amylose content of rice grains was mainly associated with genotypic differences and much less with environmental conditions, but contents decreased with higher post-anthesis ambient temperatures. The indica × japonica hybrid combined high yields with a favourable amylose content and showed a better ability to adapt to cool and to warm agro-climatic conditions than the indica or japonica genotypes. Our study showed the magnitude of yield penalties associated with growing rice genotypes in environments to which they are not adapted. The consequences of these findings for improved adaptation of rice are discussed.

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Section: Genetic Adaptation For Yield Responses To Environmentsupporting

confidence: 90%

Adaptation and performance of rice genotypes in tropical and subtropical environments

Jing

Spiertz

Hengsdijk

et al. 2010

NJAS: Wageningen Journal of Life Sciences

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“…Responses to temperature and especially photoperiod are crucial, as we now know (Roberts et al, , 1997a(Roberts et al, , 1997b, in the adaptation of crops to their environment because the timing of ripening and harvest is crucial. And much later at Reading, with other colleagues, I returned to this topic in rice Summerfield et al, 1992). It seemed important to me that we should understand more about the quantitative effects of photoperiodism in adaptation, and so I designed and built a suite of ten growth cabinets (Roberts, 1962a) to study this and the interaction of photoperiod with temperature.…”

Section: The Timing Of Seed Productionmentioning

confidence: 99%

A search for pattern and from

Roberts

1999

Seed Sci. Res.

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Seed science is a microcosm of biology which deals with a wide range of hierarchical levels of organization -from molecular biology to population ecology. Information at every level accumulates at an alarming rate. Making sense of it all calls for generalizations. Those which enable predictions to be made for circumstances different from those in which the observations were first made are particularly useful. Many scientists approach these problems by searching, consciously or unconsciously, for patterns or forms. Patterns for this purpose are defined here as discontinuities with some measure of repetition, whereas forms are thought of as continuous shapes in two or more dimensions; both can be visualized as spatial structures (most people have difficulty in conceptualising more than three or, at most, four dimensions). If one considers the whole range of hierarchical organization in biology, from molecules to communities, the recognition of the patterns and structures of processes at one hierarchical level of organization may assist in understanding the processes at adjacent levels, but such knowledge may not always be helpful in explaining processes at more remote hierarchical levels where different rules and mechanisms may predominate. Arbitrary curve fitting sometimes has a role in the recognition of the form of processes, but it is usually better to try and discover relationships where the coefficients have some biological meaning. Not only can a search for patterns and forms of processes help in the interpretation of data and the development of new ideas, but it can also sometimes help in the design of experiments. This personal view deals with some examples taken from seed research in the hierarchical levels in which I have been involved -usually somewhere between molecules and ecology.

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“…Rice is an annual warm-season grass that tillers heavily and requires stringent photoperiodic induction of flowering (Summerfield et al, 1992). Reproductive development of rice has been divided into three phases, similar to those described above for maize (Vergara, 1980;Vergara and Chang, 1985).…”

mentioning

confidence: 99%

Leaf shape and anatomy as indicators of phase change in the grasses: comparison of maize, rice, and bluegrass

Sylvester

Parker-Clark

Murray

2001

American J of Botany

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Leaf morphology and anatomy during vegetative phase change was compared in bluegrass, rice, and maize. Maize juvenile leaves are coated with epicuticular wax, lack specialized cells, such as trichomes and bulliform cells, and epidermal cell walls stain a uniform purple color. Adult maize leaves are pubescent, lack epicuticular waxes, and have crenulated epidermal cell walls that stain purple and blue. All bluegrass and rice blades are pubescent, coated with epicuticular waxes, and show purple and blue wall staining. In all three grasses, blade width steadily increases at each node until a threshold size is achieved several nodes before reproductive competence is acquired. Blade-to-sheath length showed a similar trend of continuous change followed by discontinuous change prior to reproduction. Analysis of leaf development demonstrated that maize primordia initiate more rapidly relative to blade and sheath growth than do either bluegrass or rice. We conclude that leaf shape, as defined by blade width and blade-to-sheath ratio, is a reliable indicator of phase, whereas anatomy is not a universal indicator of phase change in the grasses. We speculate that different growth patterns among these grasses may be attributed to changes in the timing of embryonic and postembryonic development.

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Photothermal Responses of Flowering in Rice (Oryza sativa)

Cited by 81 publications

References 10 publications

Adaptation and performance of rice genotypes in tropical and subtropical environments

Adaptation and performance of rice genotypes in tropical and subtropical environments

A search for pattern and from

Leaf shape and anatomy as indicators of phase change in the grasses: comparison of maize, rice, and bluegrass

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