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Grain growth and development of old and modern australian wheats


, : Grain growth and development of old and modern australian wheats. Field Crops Research 21(2): 131-146

Grain growth of old and modern varieties of Australian wheats was studied in the field to ascertain if any trends in grain growth-rate or duration have occurred in association with breeding for yield. Grains from the mid-ear spikelets of main shoots which had reached anthesis on the same day were sampled frequently for dry-matter. Linear, cubic and logistic functions were fitted to the observed dry-matter data plotted against thermal time. Estimates of grain growth-rate and duration, the time of physiological maturity and the deviation of observed and expected values were compared for each function. The morphological stages of grain development were also recorded in an attempt to identify a character which would provide an easily observed marker for the time of physiological maturity in Australian wheat varieties. The logistic function was found to be the most appropriate model to describe grain-growth in these varieties. The time when maximum grain dry-matter was achieved (physiological maturity) could not be unequivocally identified, but depended on the function fitted to the data. Most modern varieties flowered earlier, had shorter lag phases and longer durations of grain-growth than the older varieites. The final dry-matter of a grain was significantly correlated with maximum growth-rate. Grain-growth rates and maximum grain dry-matter did not demonstrate any trend with the year of release of the varieties. Of the morphological stages examined, the loss of green colour from the glumes and lemma were the most coincident with physiological maturity; however, considerable variation was evident between varieties.

US$19.90

DOI: 10.1016/0378-4290(89)90049-X


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Atwell S.M.; Mantle P.G., 1981: Hydroxy di hydro ergosine a new ergot alkaloid analog from directed biosynthesis by sphacelia sorghi. A new ergot alkaloid, 9'-hydroxydihydroergosine, was produced by axenic cultures of S. sorghi to which 4-hydroxy-proline was added when biomass accumulation was complete. Evidence for a lack of biosynthetic specificity for the 1st, 2nd and 3r...

Song, S.; Xia, M.; He, Z.; Ying, H.; Lü, B.; Chen, J., 2006: Degradation of p-nitrotoluene in aqueous solution by ozonation combined with sonolysis. p-Nitrotoluene (PNT) is a nitroaromatic compound that is hazardous to humans and is a suspected hormone disrupter. The degradation of PNT in aqueous solution by ozonation (O<sub>3</sub>) combined with sonolysis (US) was investigated in...

Castro Ana Alejandrina; Morfin V.S.rgio, 1988: Contribution to the geology of the Cerro de Oro area. Boletin del Departamento de Geologia Uni-Son 5(1-2): 25-39

Mochizuki, H.; Furubayashi, T.; Hanajima, R.; Terao, Y.; Mizuno, Y.; Okabe, S.; Ugawa, Y., 2007: Hemoglobin concentration changes in the contralateral hemisphere during and after theta burst stimulation of the human sensorimotor cortices. Using near infrared spectroscopy and repetitive transcranial magnetic stimulation (rTMS), we studied interhemispheric interactions between bilateral motor and sensory cortices in humans. RTMS consisted of a triple-pulse burst (50 Hz) repeated eve...

Abad, J.M.; Fernańdez, J.; Bollar, A.; Gelabert, M.; Mostaza, A.; García-Allut, A., 1988: Brain cysticercosis treated with praziquantel. Report of six cases. Cysticercosis is the most common parasitosis affecting the central nervous system and it is endemic in many countries. Although cysticercosis is nowadays a rare disease in Spain, three of such cases have been treated with Praziquantel at the Hospi...

Frey B.M.; Mordasini R.; Frey F.J.; Wegmueller E.; Schlierf G.; Hodler J., 1979: Dys proteinemia during total fasting. The starvation diet has become a widely adopted method of treating obesity. Unfortunately, it leads to occasionally serious complications in about 8% of the patients thus treated. There is consequently an urgent need for systematic analyses of the...

Coombes, R.C.; Howell, A.; Emson, M.; Peckitt, C.; Gallagher, C.; Bengala, C.; Tres, A.; Welch, R.; Lawton, P.; Rubens, R.; Woods, E.; Haviland, J.; Vigushin, D.; Kanfer, E.; Bliss, J.M., 2005: High dose chemotherapy and autologous stem cell transplantation as adjuvant therapy for primary breast cancer patients with four or more lymph nodes involved: long-term results of an international randomised trial. The purpose of this study was to assess whether a short course of anthracycline containing chemotherapy followed by high dose therapy with autologous stem-cell support improves disease-free and overall survival as compared with conventional, anthr...

Clifford, S.M.; Guerra, S.Mae.; Mangion, J.R., 2003: Massive metastatic intracardiac lymphoma presenting with complete heart block with resolution following chemotherapy. Echocardiography 20(2): 201-202

Søvik, O.; Selvig, S.; Finne, P.H., 1981: Metabolic responses to alanine in small-for-gestational age infants: developmental aspects. 14 small-for-gestational age (SGA) infants and 4 healthy adult volunteers were subjected to an intravenous alanine tolerance test. In normoglycemic SGA infants studied during the first 6 days of life, the apparent K value for the disappearance rat...

Balfour, H.H.; Siem, R.A.; Bauer, H.; Quie, P.G., 1973: California arbovirus (La Crosse) infections. I. Clinical and laboratory findings in 66 children with meningoencephalitis. Pediatrics 52(5): 680-691