Influence of temperature prior to seed ripening and at germination on rosette formation and bolting of Eustoma grandiflorum

Ohkawa, Kiyoshi; Korenaga, M.; Yoshizumi, T.

doi:10.1016/0304-4238(93)90070-7

Cited by 19 publications

(11 citation statements)

References 4 publications

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“…This reaction of Eustoma to 14D is considered to be due to insufficient exposure to low temperatures as confirmed in Experiment 1. Ohkawa et al (1993) pointed out that, in Eustoma grandiflorum, if seeds were matured at 23/18°C (day/ night) temperature, the formation of rosettes decreased compared with seeds matured at 33/28°C. In addition, they pointed out the possibility of completely preventing the formation of rosettes irrespective of the cultivar by combining low-temperature ripening of immature seeds with wet treatment of the seeds at lowtemperature.…”

Section: Discussionmentioning

confidence: 99%

“…To overcome this serious problem, various methods have been developed. One of them is the wet treatment of seeds at low temperature, which is reported to promote bolting of Eustoma seedlings (Kageyama et al, 1990;Ohkawa et al, 1993;Pergola et al, 1992;Tanigawa et al, 2002). Unfortunately, this treatment is limited to growers who have large refrigerators.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Re-drying Seeds after Wet Treatment at 10°C on the Germination and Growth of <i>Eustoma grandiflorum</i> (Raf.) Shinn

et al. 2018

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This study was initiated to investigate the effects of wet treatment at 10°C (WT10°C) and subsequent re-drying treatment (RDT) on the germination and growth of Eustoma grandiflorum seeds. Both treatments, WT10°C and RDT, were applied at 10°C under dark conditions. In all the experiments, 'King of Snow', which is one of the major Eustoma cultivars in Japan, was used. When the total number of days exposed to WT10°C and RDT was set to 35 days, the prevention of rosettes and the promotion of growth were dependent on the number of days of WT10°C, and these effects were maintained after RDT. When RDT was applied to the seeds after WT10°C for 35 days, the growth promotion due to WT10°C was maintained regardless of the length of redrying time from 7 to 28 days; however, the germination rate decreased with RDT. On the other hand, applying RDT after WT10°C for 14 days had no effect on the germination rate; however, the growth promotion was insufficient compared with WT10°C for 28 days. This problem was solved by carrying out a further 14 days of WT10°C after RDT. When the seeds were exposed to WT10°C for 14 days, then re-dried for 7 days, and exposed to WT10°C for a further 14 days, the same growth promotion was achieved as for seeds exposed to WT10°C for 28 days continuously. The above results suggest that the promotion of growth depends on the total number of days of WT10°C regardless of whether these days are continuous or not. Moreover, the growth promotion was maintained after RDT. The results also suggest the possibility that when both the processes of WT10°C and the RDT are carried out by seed companies, growers who have no cooling equipment can produce cut flowers using seedlings grown in the high-temperature season.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Re-drying Seeds after Wet Treatment at 10°C on the Germination and Growth of <i>Eustoma grandiflorum</i> (Raf.) Shinn

et al. 2018

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“…Moreover, high temperatures inhibit seedling production at the primary stage (Ohkawa et al, 1991). Large fluctuations between day and night temperatures also affect seedling growth and development, causing Eustoma seedlings grown in soil media to form rosettes (Ohkawa et al, 1993). Plants that form rosettes exhibit delayed flowering.…”

Section: Introductionmentioning

confidence: 99%

“…Conventional, in-soil germination of Eustoma seeds for producing seedlings has been attempted, but this technique has not proved satisfactory for commercial producers and growers, due in part to the lengthy production time (Harbaugh, 1995) and including the rosette phenotype often accompanying this propagation method (Ohkawa et al, 1993;Fukuda et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

A timeline for Eustoma grandiflorum seedling production based on an in vitro germination protocol

Roni¹,

Islam²,

Shimasaki³

2017

Plant Omics

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Eustoma (Eustoma grandiflorum) is a high-rank ornamental cut flower, and propagation of plant material by seed is an important approach for high-volume production of Eustoma. Successful propagation using different parts of the Eustoma plant has been reported in numerous studies; however, to date there have been no studies comparing the timeline differences between in vitro and conventional germination growth methods. The objective of this study was to develop a convenient and straightforward in vitro protocol that decreases the lag time to germination and the seedling development periods. Seed germination and seedling growth was studied in Eustoma (Voyage type 2 pink) seeds using two different techniques, in vitro germination and conventional sowing in soil. Seeds sown under in vitro conditions exhibited faster (6 days) germination compared with seeds sown directly in soil (11 days). Halfstrength Murashige and Skoog medium in vitro-grown seedlings (7 weeks) were more vigorous and produced true leaves earlier compared with conventionally-grown seedlings (15 weeks). In addition, when Eustoma seeds were sown in vitro, germination could be more easily tracked and visually compared with seeds sown in soil media. Therefore, the in vitro seed germination protocol developed in this study is straightforward, reproducible, and will amenable to facilitate efficient seedling production of Eustoma for commercial applications.

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“…Individuals commence stem elongation and enter the reproductive phase with exposure to specified temperatures during the early growth stage: 3°C and 10°C during germination (Ohkawa et al, 1993), or 11°C and 18°C in the early stage of growth (Pergola, 1992;Tanigawa et al, 2001). However, they almost cease stem elongation and never enter the reproductive phase without exposure to such temperatures (Harbaugh et al, 1992;Ohkawa, 2003a;Pergola, 1992).…”

Section: Introductionmentioning

confidence: 99%

Shoot and Root Growth and Lysigenous Aerenchyma Formation in Rosetted and Stem-extensional Plants of Eustoma grandiflorum (Raf.) Shinn.

Yamashita¹,

Imamura²

2007

J. Japan. Soc. Hort. Sci.

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Influences of rosetting on shoot and root growth, and the inner structure of the stem and root of Eustoma grandiflorum plants were studied. The rosetted and stem-extensional plants, regulated by thermal conditions during ripening in the previous season, were grown under the same conditions. Rosetting was marked by the severe restraint of stem elongation, thickening of stems and leaves, increasing leaf width, thickening of roots, and a change in the growth direction of roots. However, it had less of an effect on the shoot dry matter weight, leaf emergence, auxiliary bud formation, maximum root length, and lateral root formation. Furthermore, little difference was detected between the root dry matter weight of rosetted plants and that of stem-extensional plants, excluding the flowering time when the dry matter weight of the roots of stem-extensional plants tended to decrease. Both rosetted and stem-extensional plants developed lysigenous aerenchyma in the cortex of the roots and stem. This structure could contribute to the marked wetness tolerance of Eustoma grandiflorum.

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Influence of temperature prior to seed ripening and at germination on rosette formation and bolting of Eustoma grandiflorum

Cited by 19 publications

References 4 publications

Effect of Re-drying Seeds after Wet Treatment at 10°C on the Germination and Growth of <i>Eustoma grandiflorum</i> (Raf.) Shinn

Effect of Re-drying Seeds after Wet Treatment at 10°C on the Germination and Growth of <i>Eustoma grandiflorum</i> (Raf.) Shinn

A timeline for Eustoma grandiflorum seedling production based on an in vitro germination protocol

Shoot and Root Growth and Lysigenous Aerenchyma Formation in Rosetted and Stem-extensional Plants of Eustoma grandiflorum (Raf.) Shinn.

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