Thermal Hardening: A New Seed Vigor Enhancement Tool in Rice

Farooq, Muhammad; Basra, Shahzad Maqsood Ahmed; Ahmad, Nazir; Hafeez, K.

doi:10.1111/j.1744-7909.2005.00031.x

Cited by 316 publications

(212 citation statements)

References 4 publications

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“…Seeds were considered to be germinated when radicle and hypocotyl length was over 2 mm. Time taken to 50% germination of seedling (T 50 ) was calculated according to the modified formula of Farooq et al (2005) as below:…”

Section: Lab Experiment: Influence Of Aqueous Extracts Of Parthenium mentioning

confidence: 99%

Phytotoxic Activity of Parthenium Against Wheat and Canola Differ With Plant Parts and Bioassays Techniques

et al. 2016

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-Phytotoxic effects of invasive weed Parthenium hysterophorus were studied by using whole plant, leaf and root aqueous extracts at 0, 2.5, 5.0, 7.5 and 10% (w/v) concentrations against germination and early seedling growth of wheat and canola. Studies were carried out both in Petri plates with filter paper as substratum placed in controlled conditions and soil-filled plastic pots placed in open environments. Pronounced variation was noted for phytotoxic activity of different plant parts of parthenium, aqueous extract concentrations, test species, and bioassay techniques. Aqueous parthenium extracts either inhibited or delayed the germination and suppressed seedling growth of test species over control. For both test species, all the germination attributes were suppressed to a greater extent in Petri plates than in plastic pots. Leaf extracts were more suppressive to germination of test species than whole plant and root extracts. Increasing extract concentration beyond 2.5% caused significant reduction in seedling dry biomass of both test species. Aqueous parthenium extract diminished chlorophyll contents of wheat and canola by 32-63% and 29-69%, respectively. Nevertheless, an increase of 9-172% and 22-60% in phenolic contents of wheat and canola was recorded. Canola appeared to be more susceptible than wheat at all extract concentrations. Present study concluded that bioassays conducted under controlled condition using filter paper as substratum may be misleading due to over estimation of allelopathic response and variation in potential of receiver and donor species. Furthermore, it implies that threshold concentrations of allelochemicals for test species in Petri plates are rarely reached under field conditions. Keywords: allelopathic inhibition, aqueous extracts, bioassay techniques, germination dynamics, parthenium, phenolics, seedling growth. Palavras-chave: inibição alelopática, extratos aquosos, técnicas de bioensaios, dinâmica de germinação, parthenium, compostos fenólicos, crescimento de plântulas. RESUMO -Foram estudados os efeitos fitotóxicos da planta daninha invasora

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Section: Lab Experiment: Influence Of Aqueous Extracts Of Parthenium mentioning

confidence: 99%

Phytotoxic Activity of Parthenium Against Wheat and Canola Differ With Plant Parts and Bioassays Techniques

et al. 2016

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“…The seeds were considered to be germinated when the radicle and hypocotyl lengths were over 2 mm. The time taken up to 50% emergence of the seedlings (E 50 ) was calculated according to the modified formulae of Farooq et al (2005):…”

Section: Preparation Of Extractsmentioning

confidence: 99%

Toxic action of aqueous wheat straw extract on horse e purslane

et al. 2012

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-The toxic action of aqueous wheat (Triticum aestivum) straw extracts was investigated on germination, early seedling growth, some biochemical attributes and the antioxidant enzymes of horse purslane (Trianthema portulacastrum). Aqueous extracts of wheat straw were prepared by soaking the wheat straw in distilled water in 1:10 w/v ratio and diluted to obtain the concentrations of 0, 25, 50, 75 and 100%. These were used as pre and post emergence in laboratory and screen house trials. Wheat aqueous extracts exhibited phytotoxicity to horse purslane by inhibiting and delaying its germination and suppressing seedling growth. Wheat phytotoxins in its aqueous extracts suppressed the chlorophyll content and soluble protein, and enhanced soluble phenolics and the activity of antioxidant enzymes as catalase, peroxidase and superoxide dismutase in the seedlings of horse purslane compared with the control. Such inhibitory activity is believed to originate from exposure to wheat phytotoxins that are present in its aqueous straw extract. The suppressive effects of wheat straw need to be investigated further under field conditions. Keywords: phytotoxins, germination, seedling growth, phenolics, antioxidants.RESUMO -A ação tóxica de extratos aquosos da palha de trigo (Triticum aestivum) foi investigada na germinação, no crescimento inicial da plântula, em alguns atributos bioquímicos e nas enzimas antioxidantes de beldroegas-cavalo (Thianthema portulacastrum). Extratos aquosos de palha de trigo foram preparados pela imersão deste em água destilada na proporção de 01:10 m/v e diluidos para obtenção de cinco concentrações (0, 25, 50, 75 e 100%). Estes foram usados como pré e pós-emergência em ensaios de laboratório e casa de vegetação. Os extratos aquosos de trigo exibiram toxicidade às beldroegas-cavalo, inibindo e retardando a sua germinação e suprimindo o crescimento das plântulas. Toxinas no extrato aquoso de trigo suprimiram o teor de clorofila e proteína solúvel, aumentaram os fenóis solúveis e a atividade de enzimas antioxidantes como catalase, peroxidase e superóxido dismutase em plântulas de beldroega-cavalo comparado ao controle. Acreditase que essa atividade inibitória origina-se da exposição das beldroegas-cavalo às toxinas presentes no extrato aquoso de palha de trigo. Efeitos supressivos da palha de trigo precisam ser investigados em condições de campo.Palavras-chave: palha de trigo, toxinas, germinação, crescimento das plântulas, fenólicos antioxidantes.

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“…where N is the final number of seeds that germinated and n i and n j were the cumulative number of seeds germinated by adjacent counts at times t i and t j when ni < N/2 < nj (Coolbear et al 1984, Farooq et al 2005. Germination was defined as the visible emergence of the radicle through the seed coat (Maguire 1962, Galmés et al 2006).…”

Section: Germination Testmentioning

confidence: 99%

Effects of hormonal priming on seed germination of pigeon pea under cadmium stress

Sneideris

Gavassi

Campos

et al. 2015

An. Acad. Bras. Ciênc.

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In this work we investigated whether priming with auxin, cytokinin, gibberellin, abscisic acid and ethylene, alters the physiological responses of seeds of pigeon pea germinated under water and cadmium stress. Seeds treated with water or non-treated seeds were used as control. Although compared to non-treated seeds we found that the hormone treatments improve the germination of pigeon pea under cadmium stress, however, these treatments did not differ from water. However, we also observed a trend of tolerance to the effects of cadmium in the presence of ethylene, suggesting that the use of this hormone may be an efficient method to overcome seed germination under metal stress.

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Thermal Hardening: A New Seed Vigor Enhancement Tool in Rice

Cited by 316 publications

References 4 publications

Phytotoxic Activity of Parthenium Against Wheat and Canola Differ With Plant Parts and Bioassays Techniques

Phytotoxic Activity of Parthenium Against Wheat and Canola Differ With Plant Parts and Bioassays Techniques

Toxic action of aqueous wheat straw extract on horse e purslane

Effects of hormonal priming on seed germination of pigeon pea under cadmium stress

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