Environmental Influences on Seed Quality of Windmillgrass Ecotypes in South Texas

Herrera-C, F.; Ocumpaugh, W. R.; Ortega-S., J. Alfonso; Lloyd-Reilley, John; Rasmussen, G. Allen; Maher, Shelly D

doi:10.2134/agronj2007.0195

Cited by 9 publications

(7 citation statements)

References 33 publications

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“…It could be concluded with this that the persistence of the species is assured under unfavorable conditions as argued by Abdel Ghani et al (2002) for Hordeum spontaneum and H. vulgare. Similar results were obtained by Herrera et al (2008) in Chloris cucullata and C. subdolichostachys where the percentage of full and dormant seeds changed among years with different distributions of precipitation, but without altering viability.…”

Section: Reproductive Biomass Productionsupporting

confidence: 82%

Effect of Quantity and Distribution of Rainfalls on Hordeum murinum L. Growth and Development

Johnston

Olivares²,

Calderón³

2009

Chilean J. Agric. Res.

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The growth and development of Hordeum murinum L. seeds growing with extreme pluviometric regimes in cool greenhouse conditions were evaluated. Seven treatments according to quantity and distribution of real rainfalls of the semiarid zone of the Metropolitan Region, Chile were applied: rainy-late, normal-late, dry-early, rainy-normal, normal-early and dry-late, plus a reference without water stress, at 2/3 field capacity. The experimental design was randomized complete blocks with five replicate pots. Seeds produced in the last year were sown in pots with disinfected soil leaving the more uniform plants after emergence. Evaluations were made of phytomass production, spearing shoots of roots, the quantity of floral stems and seeds, their total weight and the proportion of seed annex structures, and the viability and germination capacity of seeds. The life cycle of dry years was shortest and with the least dry shoot matter production, the rainy-normal and normal-late years had similar dry root matter production, therefore the most important factor was rainfall distribution. All the reproductive growth values were lower than the reference. There was no seed production in both distributions of dry years and in the normal-early. There were only differences in late distributions, there were no differences among treatments in seed quality. Thus, H. murinum uses its resources principally for seed production and late distributions determined seed production.

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Section: Reproductive Biomass Productionsupporting

confidence: 82%

Effect of Quantity and Distribution of Rainfalls on Hordeum murinum L. Growth and Development

Johnston

Olivares²,

Calderón³

2009

Chilean J. Agric. Res.

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“…Seedling emergence is determined by several factors, with water availability being the most important factor (Herrera et al, 2008). Water availability also affects the proportion of seeds with tegumentary dormancy and the proportion of nonviable seeds (Johnston et al, 1998a).…”

Section: Introductionmentioning

confidence: 99%

Effect of rainfall regimes on seed production and quality of Avena barbata

2009

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A. Olivares, M. Johnston, and C. Calderón. 2009. Effect of rainfall regimes on seed production and quality of Avena barbata. Cien. Inv. Agr. 36(1): 69-76. The effects of rainfall amount and distribution on seed yield and quality in Avena barbata were evaluated in a greenhouse under controlled conditions with simulated rainfall regimes. A randomized complete-block design was used with fi ve replications of one pot each. Seven treatments were established according to rainfall regimes for a real year in the semiarid zone in the Metropolitan Region, Chile: normal rainfall (1982), late rainfall (1987), normal-early rainfall (1962), normallate rainfall (1989), dry-early rainfall (1981) and dry-late rainfall (1990). One treatment without water stress was left for comparison. One-year-old seeds were planted in pots with disinfected soil. The fi ve most uniform plants in terms of size and health were chosen for the experiments. The simulated rainfalls were applied according to calendar dates of each selected year. The roots' and shoots' mass production was evaluated. The number of fl oral shoots, fruits and seeds; their total weights and separating annexes; as well as the number of fi lled seeds, seed viability and germination were also determined. Based on the results obtained, a rainy year with late rainfall distribution highly favored mass production; in addition, the seeds' quality was better in years with late rainfall distribution, normal or rainy. The proportion of fi lled seeds was greater in the rainy-normal rainfall year, and the seed annexes were better in the late rainy year. The results indicate that the production, quality of grains and phenology of A. barbata were modifi ed with the rainfall distribution.

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“…Finally, we have to consider the biotypes used in this study did not originate at the same site, with the same environmental conditions. We know one of the factors affecting seed quality is the site of seed production (RAO et al 2017), in spite of, in some cases, no influence may also be observed (HERRERA et al 2007). However, almost all studies on weed resistance is carried out using biotypes from different places, because is not easy to obtain seeds of susceptible-and resistant-biotypes from the same site.…”

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confidence: 99%

A qualidade de sementes de buva pode ser reduzida devido à resistência a glyphosate?

Costa

Stinghen²,

Bortoli³

et al. 2015

Rev. Ciênc. Agrovet.

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The resistance to glyphosate may provide a penalty on plant growth and physiology. We investigate if the resistance to glyphosate reduces the seed quality of Conyza bonariensis by performing seed viability and vigor tests under a completely randomized design with four replicates of 50 seeds for both glyphosatesusceptible (S) and -resistant (R) biotypes. Low seed viability (<50%) was found in both S and R biotypes. No difference occurred between either S and R biotypes on seed germination and embryo viability. The percentage of seed germination of the S biotype was higher than the R biotype in the cold test (~58%), accelerated aging test (~84%), and high-temperature stress test (~45%). This is the first time one found evidences that resistance to glyphosate may be responsible for a penalty on seed quality of C. bonariensis.A resistência a glyphosate pode proporcionar penalidade ao crescimento e à fisiologia das plantas. Foi investigado se a resistência a glyphosate reduz a qualidade da semente de Conyza bonariensis por meio de testes de viabilidade e vigor de semente, utilizando-se de delineamento inteiramente casualizado com quatro repetições de 50 sementes tanto para biótipos suscetíveis (S) quanto resistentes (R) a glyphosate. Observou-se baixa viabilidade de sementes (<50%) nos biótipos S e R. Não houve diferença entre os biótipos S e R na germinação de sementes e na viabilidade do embrião. A porcentagem de germinação de sementes do biótipo S foi maior que o biótipo R no teste de frio (~58%), no teste de envelhecimento acelerado (~84%) e no teste de estresse por alta temperatura (~45%). Esta é a primeira vez que se observa que a resistência a glyphosate pode ser responsável por penalidade na qualidade da semente de C. bonariensis. PALAVRAS-CHAVE:Conyza bonariensis, resistência a herbicida, vigor de semente.

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Environmental Influences on Seed Quality of Windmillgrass Ecotypes in South Texas

Cited by 9 publications

References 33 publications

Effect of Quantity and Distribution of Rainfalls on Hordeum murinum L. Growth and Development

Effect of Quantity and Distribution of Rainfalls on Hordeum murinum L. Growth and Development

Effect of rainfall regimes on seed production and quality of Avena barbata

A qualidade de sementes de buva pode ser reduzida devido à resistência a glyphosate?

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