Some Effects of ‘Hardening’ Carrot Seed

Austin, R. B.; Longden, P. C.; Hutchinson, J

doi:10.1093/oxfordjournals.aob.a084334

Cited by 78 publications

(40 citation statements)

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“…Highest invigoration was observed in seeds subjected to H+C+H. The beneficial aspects of seed hardening are primarily due to pre-enlargement of the embryo (Austin et al 1969), improvement of the germination rate (Gray and Steckle 1977), and effects that are attributed to alternating wetting and drying processes (Basra et al 2003). Higher enhancement was noted in seeds subjected to dry heat treatment first compared with seeds subjected to chilling first (Tables 1, 2).…”

Section: Discussionmentioning

confidence: 99%

“…Seeds subjected to H+C exhibited higher values of the time to start germination, even more than that of control, and similar reports have been published by Farooq et al (2004), who stated that japonica rice seeds exposed to dry heat treatments results in delayed germination. The improved performance of seeds subjected to alternate low and high temperatures may be the result of pre-enlargement of the embryo (Austin et al 1969) and improvement of the germination rate (Gray and Steckle 1977), which are attributed to alternating wetting and drying processed (Basra et al 2003). The vigor enhancement as a result of alternating low and high temperatures may also be due to the hardening process, as observed in alternate wetting and drying.…”

Section: Figmentioning

confidence: 99%

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Thermal Hardening: A New Seed Vigor Enhancement Tool in Rice

Farooq

Basra

Ahmad

et al. 2005

J Integrative Plant Biology

316

191

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Abstract:In a laboratory study, indica and japonica rice (Oryza sativa L.) seeds were exposed to thermal hardening (heating followed by chilling followed by heating; chilling followed by heating followed by chilling; heating followed by chilling or chilling followed by heating). In indica rice, heating followed by chilling followed by heating resulted in decreased mean germination time, time to start germination, electrical conductivity of seed leachates, and time to 50% germination, as well as increased germination index, energy of germination, radicle and plumule length, root length, root/shoot ratio, root fresh and dry weight, radicle and plumule growth rate, and shoot fresh weight. In japonica rice, chilling followed by heating followed by chilling performed better than all other treatments, including control.

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Section: Discussionmentioning

confidence: 99%

Section: Figmentioning

confidence: 99%

Thermal Hardening: A New Seed Vigor Enhancement Tool in Rice

Farooq

Basra

Ahmad

et al. 2005

J Integrative Plant Biology

316

191

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“…Seed priming with water has been studied in some vegetables, including carrot, onion, and tomato [7][8][9][10], wheat [11], and some weeds [12]. Seed priming is a very efficient technique to increase the speed of germination without compromising on germination rates and in some plant species, the seeds obtained with priming emerge from the soil faster and often more uniformly than non-primed seeds.…”

Section: Introductionmentioning

confidence: 99%

Effects of Seed Hydropriming on Germination and Seedling Vigor during Emergence of Rice under Different Soil Moisture Conditions

Matsushima¹,

Sakagami²

2013

AJPS

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Seed priming is a physiological seed enhancement method. Hydro-or osmotic priming can advance germination under adequate moisture conditions. During direct seeding on well-drained paddy and upland fields, rice seeds occasionally encounter low soil moisture conditions. Under these conditions, rice seeds need to undergo rapid germination and secure emergence through improved water absorption capacity and seed bioactive. This study aims to clarify the effects of seed hydropriming on germination and seedling vigor in rice under different soil moisture conditions. The study employed three hydration conditions such as priming, soaking, and control. The seeds to be primed and soaked were submerged in tap water at 30˚C for 12 h. For priming, the seeds were subsequently dried to attain their initial seed weight, but the seeds for soaking were not dried before sowing, and the control seeds were untreated. In addition, different soil moisture conditions, such as 3%, 6%, 8%, 11%, 15%, and 20%, were set. Therefore, emergence time shortened with seed priming at 3% -11% soil moisture contents. In particular, at 8% soil moisture content, priming and soaking decreased emergence time by 26.8 h and 21.7 h, respectively compared with that of the control. At 8% -15% soil moisture contents, shoot elongation rate obtained with the priming seeds increased >1.2 times compared with that obtained with the control and soaking seeds. At >8% soil moisture content, shoot dry weight obtained with the priming seeds increased >1.3 times compared with that obtained with the soaking seeds. Furthermore, at declining soil moisture conditions, the increase in root dry weight is promoted by seed priming compared with that in the control seeds. These results suggest that increased root growth affects plant water absorption under low soil moisture conditions due to priming. This study demonstrates that seed priming facilitates rapid emergence and seedling vigor, unless extremely dry or flooded soil moisture conditions are present at seeding.

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“…2 B, D (H EGARTY , 1978). In fact, several studies (A USTIN et al, 1969 ;BE UR m & DRE NN A N , 1971 ;HA N SON, 1973) …”

Section: Seedling Length and Dry Weightmentioning

confidence: 97%