Single-plant characters as a measure of field plot performance of wheat cultivars

Syme, JR

doi:10.1071/ar9720753

Cited by 43 publications

(25 citation statements)

References 4 publications

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“…Further research is necessary to estimate this correlation. Syme (1972) and Fischer & Kertesz (1976) working with spring wheat (Triticum aestivum) concluded from their data that the harvest index of spaced plants offers a better criterion for improving grain yield under dense stands than grain yield itself or yield components. Our study, however, found harvest index to be a poor criterion for improving grain yield ( Table 4).…”

Section: Traitmentioning

confidence: 99%

Biometrical analysis of alternative plot types for selection in rye

1991

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Maximizing the efficiency of selection for yield and baking quality of winter rye (Secale cereale L.) requires reliable knowledge on the pertinent population parameters. This study reports estimates of variances, heritabilities and genetic correlations from a) large (= 5 mZ) drilled (LD) plots, b) micro drilled (MD) plots, and c) one-row plots of 4 spaced plants (SP). Thirty eight single crosses of rye were grown at two locations for two years in LD, MD and SP plots replicated 2, 4, and 6 times, respectively. Genotypic differences were significant in all plot types for all agronomic and quality traits, although estimates of genetic variances were smaller in LD than MD or SP plots for grain yield, 32-spike weight, and kernels per spike. Heritabilities on an entry mean basis (0.62 to 0.95) were similar among plot types, but on a single plot basis estimates were lower for SP than for MD or LD plots. Genetic correlations were high between all three plot types, with correlations between LD and SP plots being approximately 1.0 for falling number, thousand-kernel weight, and bloom date, 0.90 for grain yield, kernels per spike, test weight and height, and 0.70 for tiller number. Based on the high heritabilities achieved in small plots and the close agreement between MD-or SP-with LD-plot performance we conclude that greater use should be made of small plot types when selecting for yield and quality in winter rye.

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Section: Traitmentioning

confidence: 99%

Biometrical analysis of alternative plot types for selection in rye

1991

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“…While, Syme (1972) and Fischer and Kertesz (1976) reported a close relationship of resource allocation to the grains with yield potential.…”

Section: Morphological Charactersmentioning

confidence: 99%

Studies on endogenous hormonal changes during grain development in wheat genotypes

Gutam¹

2017

Preprint

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Pot culture experiment was conducted in the Rabi seasons of 2001 and 2002 in order to study the genotypic differences in grain growth rates and endogenous hormonal contents in the developing grains. The hexaploid new plant types and extant variety and other tetraploids are taken up for the study. The data on yield and yield components show that the tetraploids had higher ear number per plant but lesser number of seeds per ear and lower seed weight per ear. The most important yield component 1000-grain yield was also possessed by hexaploids. The mean plant height was found to be higher in hexaploids over tetraploids in general, and among them DL- 1266-1 and DL-1266-2 (new plant types) recorded higher plant height. Similarly, the ear length was also higher in these new plant types. But, the tiller number/plant and ear number/plant were significantly higher in tetraploids. The new plant types (hexaploids) possessed maximum grain growth rate at 5–15 DAA. DL-1266-2 recorded highest grain growth rate 0.093 g/g/day. The photosynthetic rate values show that the hexaploids possessed higher rate than tetraploids. At 7 and 15 DAA, in general, photosynthetic rate was more when compared to 25 DAA and 35 DAA. The results showed that the endogenous hormonal contents in grains during grain development had changed in sequence. At 7 DAA, gibberellic acid (GA3) content was at maximum and at 15 DAA (rapid growth phase), indole-acetic acid (IAA) reached maximum and at 25 DAA (dough stage), ABA was at the maximum. At the 35 DAA, ABA reached all time high and GA3 the least, IAA being intermediate. Among the genotypes, hexaploids recorded higher concentrations of endogenous hormones. The total chlorophyll content in flag leaves of hexaploids was higher than tetraploids. The mean total chlorophyll had increased slightly at 20 DAA when compared to 10 DAA and it decreased at 30 DAA. It appears that the high yielding hexaploids (DL-1266-1 & Dl- 1266-2) by the virtue of possessing more 1000-grain weight and leaf area along with endogenous hormones might be responsible for higher yield as compared to tetraploids. It appears that better photosynthetic rate and better mobilization of photosynthates during grain filling stage contributes for higher yield in hexaploids.

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“…Numerous studies by plant breeders, using both forage species (e.g., Lazenby, 1957;Knight, 1960;Copeman and Swift, 1966) and crop species (e.g., Syme., 1972;Fischer and Kertez, 1976), have shown that only weak correlations exist between the yield of genotypes or populations as spaced-plants and their yield in dense monocultures. Few such comparisons have been made in the context of the ecological genetics of plant species, and the effects of competition on attributes other than yield have received little attention, though Caradus and Snaydon (1986) have compared populations of T repens for a number of morphological and physiological attributes in a diversity of conditions; they found widely different correlations, depending on the particular attributes and conditions considered.…”

Section: The Spaced-plant Trial Techniquementioning

confidence: 99%

“…The main exception to this is that plant breeders have made many comparisons of the performance of genotypes and populations as spacedplants and in dense stands (e.g., Lazenby, 1957 and 1965; Knight, 1960;Copeman and Swift, 1966;Syme, 1972;Fischer and Kertez, 1976). …”

Section: Introductionmentioning

confidence: 99%

An assessment of the spaced-plant trial technique

Davies

Snaydon

1989

Heredity

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The study was designed to investigate the effects of ramet size, site conditions and fertilizer applications on the relative performance of plant populations, when grown in spaced-plant trials. The effects of other factors are also considered.Ten-fold differences in initial ramet size had little effect on the subsequent performance of eight contrasting genotypes of the grass species Anthoxanthum odoratum. Increasing the number of planted tillers per ramet from one to four slightly increased plant survival, but did not significantly affect plant height, plant yield or flowering date. Planting large tillers slightly increased plant yield but did not significantly affect plant survival, height or flowering date. The subsequent effects of initial ramet size were always small, compared with differences between genotypes, and there were no significant genotype x ramet size interactions.Six diverse populations of A. odoratum were grown in spaced-plant trials at three sites with contrasting soils, and with various additions of nitrogen and phosphorus fertilizer. There were large differences between populations in panicle height, vegetative height, shoot dry weight, flowering date and disease susceptibility. The]re were no significant population x N or population x P interactions, but there were significant population x site interactions for panicle height, shoot dry weight and mildew score, so that the performance of the various populations was not significantly correlated between sites.On the basis of this and other studies, we conclude that the relative performance of populations in spaced-plant trials is little affected by initial ramet size or by fertilizer applications. By contrast, relative performance is greatly affected by differences between sites in soil type and climate.The limitations of extrapolating the results of spaced-plant trials to the competitive conditions that normally exist in both natural and agricultural plant communities are briefly discussed.

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Single-plant characters as a measure of field plot performance of wheat cultivars

Cited by 43 publications

References 4 publications

Biometrical analysis of alternative plot types for selection in rye

Biometrical analysis of alternative plot types for selection in rye

Studies on endogenous hormonal changes during grain development in wheat genotypes

An assessment of the spaced-plant trial technique

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