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Differential vegetative and reproductive performances among fifteen guinea grass hybrids. Repositório Alice
USBERTI-FILHO, J.A.; USBERTI, R.; PATERNIANI, R.S..
The main scope of this work was to detect (Panicum maximum Jacq.) genotype differences as to morphoagronomic and seed quality indices, and to establish character correlations useful for determining vegetative and reproductive trends. Besides the flowering cycle, eight phenological and two seed quality traits were scored in a greenhouse randomized complete block experiment, as follows: plant height (PH), reproductive tiller number/overall tiller number (RTN/OTN), panicle number/reproductive tillers (PN/RT), leaf length (LL), leaf width (LW), panicle length (PL), fresh weight (FW), dry weight (DW), number of seeds/g (NS/G) and seed sample physical purity (SPP). Very-early and early-flowering hybrids consistently showed the highest correlation values among...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Panicum maximum; Flowering; Agronomic characters; Vegetative propagation; Floração; Características agronômicas; Propagação vegetativa.
Ano: 2002 URL: http://www.alice.cnptia.embrapa.br/handle/doc/106760
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Endogenous growth regulator detection in Guinea grass seeds. Repositório Alice
USBERTI, R.; VALIO, I.F.M..
Foi detectada a atividade/nivel endogeno de reguladores de crescimento em sementes de capim-coliniao (Panicum maximum Jacq.), especie muito usada para formacao de pastagens nos tropicos, visando explicar o seu alto nivel de dormencia. As sementes foram previamente escarificadas, ou nao, com acido sulfurico, e osmocondicionadas em PEG-6000. Os reguladores de crescimento foram detectados como segue: atividade giberelinica (bioteste do hipocotilo de alface), citocininas (bioteste do aumento do peso fresco de cotiledones de rabanete), e ABA (espectrofotometria a 230 nm). A aplicacao exogena de GA, aumentou a germinacao, enquanto ABA inibiu-se completamente. Amostras com alta dormencia apresentaram maior atividade giberelinica que as de baixa dormencia, bem...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Germinacao; Dormencia; Osmocondicionamento; Panicum maximum; Germination; Dormancy; Osmoconditioning.
Ano: 1997 URL: http://www.alice.cnptia.embrapa.br/handle/doc/89888
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Prediction of cottonseed longevity Repositório Alice
USBERTI, R.; ROBERTS, E.H.; ELLIS, R.H..
The objective of this work was to determine the viability equation constants for cottonseed and to detect the occurrence and depletion of hardseededness. Three seedlots of Brazilian cultivars IAC-19 and IAC-20 were tested, using 12 moisture content levels, ranging from 2.2 to 21.7% and three storage temperatures, 40, 50 and 65ºC. Seed moisture content level was reached from the initial value (around 8.8%) either by rehydration, in a closed container, or by drying in desiccators containing silica gel, both at 20ºC. Twelve seed subsamples for each moisture content/temperature treatment were sealed in laminated aluminium-foil packets and stored in incubators at those temperatures, until complete survival curves were obtained. Seed equilibrium relative...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Gossypium hirsutum; Seed storage; Hardseededness; Viability equation; Armazenamento; Sementes duras; Equação de viabilidade.
Ano: 2006 URL: http://www.alice.cnptia.embrapa.br/handle/doc/121631
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Seed viability constants for Eucalyptus grandis. Repositório Alice
FANTINATTI, J.B.; USBERTI, R..
This work aimed to analyse Eucalyptus grandis W.Hill ex Maiden seed behaviour, under controlled deterioration, and to estimate viability equation constants for the species. Seeds were harvested in the growing season of 1999, and the moisture contents were adjusted from 11.3% to a range between 1.2 and 18.1% at 25ºC. The subsamples were sealed into laminate aluminium-foil packets, for storage in incubators at 40, 50 and 65±0.5ºC. The seeds presented orthodox performance, in which the constants for predicting seed longevity of E. grandis were KE = 9.661, CW = 6.467, CH = 0.03498 and CQ = 0.0002330. The usual and inverse relationship between water content and seed longevity was also observed. The lowest moisture content limit for application of the viability...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Seed deterioration; Storage; Seed longevity; Deterioração de sementes; Armazenamento; Longevidade de sementes.
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/handle/doc/120762
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