Dehydration of germinating perennial ryegrass seeds can alter rate of subsequent radicle emergence

Debaene-Gill, Susan B.; Allen, Phil S.; White, Donald B.

doi:10.1093/jxb/45.9.1301

Cited by 33 publications

(15 citation statements)

References 24 publications

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“…Drying the seed slowly by controlling humidity during the process may prolong germination rates achieved through conditioning. Rapid drying of imbibed seed has been shown to decrease the rate of germination in perennial ryegrass (Debaene-Gill et al 1994). However, drying the seed slowly would entail additional equipment to control humidity-Even with osmoconditioning, slow root growth may negate any benefits derived from rapid germination.…”

Section: Discussionmentioning

confidence: 99%

Germination and Root Growth of 4 Osmoconditioned Cool-Season Grasses

Mueller¹

1996

Journal of Range Management

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Establishment of grass species used in range reseeding should improve if germination time can be decreased. Osmotically controlling the hydration of seed so that germination processes proceed other than radicle emergence (osmoconditioning) can decrease germination time of many plant species. Growth chamber esperiments were conducted to evaluate effects of osmoconditioning at -1.5, -2.0, and -2.5 hlpa for 4,8,12,16, and 20 days on germination and root growth of 'Flintlock' western wheatgrass (Pascopyrum smithii (Rydb.) A. Li5ve) and 'Vinall' Russian wildrye (Psathyrostuchys juncea (Fischer) Nevski) and at -2.0, -2.5, and -3.0 hWa for 4, 8, 12, 16, and 20 days on 'Nordan' Crested wheatgrass (Agropyron desertorum (L.) Gaertn.) and 'Tegmar' intermediate wheatgrass (Agropyron intermedium (Host) Beauv.). A second study looked at germination time of seed from the same species conditioned at osmotic potentials and durations producing the shortest time to 50% germination (optimum conditioning) and air dried for 0, 1, or 7 days. Conditioned seed of Russian wildrye and western wheatgrass germinated 2 to 4 days faster, respectively than untreated seed. Optimum conditioning of seed from all 4 species produced seedlings with roots 20 to 67% shorter 4 days after germination than seedlings from untreated seed. Conditioned western wheatgrass seed continued to germinate faster than untreated seed after being air dried for 7 days. Slow root growth from conditioned seed may negate any benefits derived from rapid germination.

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Section: Discussionmentioning

confidence: 99%

Germination and Root Growth of 4 Osmoconditioned Cool-Season Grasses

Mueller¹

1996

Journal of Range Management

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“…Since both endogenous ABA content and ethylene production levels increase in response to a number of biotic and abiotic stresses, their putative roles in plant stress tolerance have been evaluated for a large number of species, including perennial ryegrass. In perennial ryegrass, dehydration of seeds following the initiation of germination did not increase endogenous ABA levels, although in separate experiments, where ABA was applied as a seed soak at 10 −6 mol L −1 , germination was inhibited . Other studies on the water status of perennial ryegrass plants have shown that increasing levels of water stress were positively correlated with elevated concentrations of endogenous ABA .…”

Section: Plant Hormonesmentioning

confidence: 74%

“…In perennial ryegrass, dehydration of seeds following the initiation of germination did not increase endogenous ABA levels, although in separate experiments, where ABA was applied as a seed soak at 10 −6 mol L −1 , germination was inhibited. 89 Other studies on the water status of perennial ryegrass plants have shown that increasing levels of water stress were positively correlated with elevated concentrations of endogenous ABA. 90,91 Also, over-expression of the CBF gene is positively correlated with increasing concentrations of endogenous ABA in leaf tissues of multiple plant species 92 and for perennial ryegrass plants CBF over-expression was associated with increased drought stress tolerance.…”

Section: Abscisic Acid and Ethylenementioning

confidence: 95%

“…93 Although over-expression of ABA biosynthetic genes leads to increased drought tolerance in several species, 75 -77 the constitutive increase in ABA content may suppress seed germination, 79,80 as has been shown for perennial ryegrass. 89 Therefore, only applications of ABA before or at the initiation of drought (or heat) stress may increase plant tolerance to drought, thereby leading to increased pasture shoot dry matter production. Ethylene…”

Section: Abscisic Acidmentioning

confidence: 99%

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Evaluating the use of plant hormones and biostimulators in forage pastures to enhance shoot dry biomass production by perennial ryegrass (Lolium perenneL.)

et al. 2015

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Fertilisation of established perennial ryegrass forage pastures with nitrogen (N)-based fertilisers is currently the most common practice used on farms to increase pasture forage biomass yield. However, over-fertilisation can lead to undesired environmental impacts, including nitrate leaching into waterways and increased gaseous emissions of ammonia and nitrous oxide to the atmosphere. Additionally, there is growing interest from pastoral farmers to adopt methods for increasing pasture dry matter yield which use 'natural', environmentally safe plant growth stimulators, together with N-based fertilisers. Such plant growth stimulators include plant hormones and plant growth promotive microorganisms such as bacteria and fungi ('biostimulators', which may produce plant growth-inducing hormones), as well as extracts of seaweed (marine algae). This review presents examples and discusses current uses of plant hormones and biostimulators, applied alone or together with N-based fertilisers, to enhance shoot dry matter yield of forage pasture species, with an emphasis on perennial ryegrass.

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“…The fact that seeds which germinated more rapidly were not always more likely to lose their viability after 8 mmP (e.g., compare the results for barley with those for sesame in Table 2) suggests that seed germination and subsequent radicle death by drought were not solely responsible for the loss of seed viability after 8 mmP of irrigation. It is possible that the radicles emerging from rapidly germinating seeds (especially those of barley) in response to 8 mmP of irrigation may have survived the subsequent drought conditions (Gutterman and Gozlan, 1998;Huang, Dong, and Gutterman, 2004), and=or that imbibition and subsequent drying of the seeds may have degraded the viability of slowly germinating seeds (especially those of sesame) before radicle emergence (Debaene-Gill, Allen, and White, 1994;Jansen and Ison, 1994). On the other hand, whereas carrots showed very slow germination, high sensitivity of seed germination and radicle growth to low water potential, and low seedling emergence percentages in the single irrigation treatments, the 8 mmP of irrigation appeared to have caused seed imbibition and enhanced seed germination in response to the subsequent 24 mmP of irrigation.…”

Section: Discussionmentioning

confidence: 99%

Comparison of Initial Growth Responses to Water Availability of Two Chinese Desert Dune Species and Nine Cultivated Species

Tobe¹

2009

Arid Land Research and Management

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Seed traits and germination responses to water availability can be related to seedling emergence and survival in sand and thus can affect the adaptability of species to desert dune environments. Water absorption by seeds, germination speed, responses of germination to water stress (imposed using polyethylene glycol-6000), and the effects of irrigation on seedling emergence and survival in sand were compared among two desert dune herbs from northeastern China (Astragalus adsurgens and Melilotus albus) and nine cultivated species (lettuce, carrot, turnip, sesame, Welsh onion, radish, cucumber, barley, and snap bean). Seeds that germinated rapidly after irrigation, those that germinated under low water potential, and those with small dry weight tended to produce emergent seedlings in response to a smaller amount of irrigation. However, these seedlings did not survive long, indicating that ready seedling emergence did not always promote seedling establishment. Drought resistance of seedlings was not correlated with seed traits or germination responses. The results indicated that the desert dune species were not less sensitive to water deficiency than the cultivated species at the initial growth stage. This may result from the fact that precipitation occurs predominantly during the summer in the desert dunes of northeastern China. As a result, species tend not to suffer from water deficiency during the initial growth stage.

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Dehydration of germinating perennial ryegrass seeds can alter rate of subsequent radicle emergence

Cited by 33 publications

References 24 publications

Germination and Root Growth of 4 Osmoconditioned Cool-Season Grasses

Germination and Root Growth of 4 Osmoconditioned Cool-Season Grasses

Evaluating the use of plant hormones and biostimulators in forage pastures to enhance shoot dry biomass production by perennial ryegrass (Lolium perenneL.)

Comparison of Initial Growth Responses to Water Availability of Two Chinese Desert Dune Species and Nine Cultivated Species

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