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Embryo growth and dormancy in seeds of six Hosta species native to Korea
Plant Species Biology ( IF 1.4 ) Pub Date : 2019-08-20 , DOI: 10.1111/1442-1984.12248
Sun‐Hee Ryu 1 , Jeffrey L. Walck 2 , Siti N. Hidayati 2 , Yong‐Ha Rhie 3 , Jong‐Cheol Yang 1 , Seung‐Youn Lee 1, 4
Affiliation  

Although it has been speculated that Hosta seeds have an underdeveloped embryo and morphological (MD) or morphophysiological dormancy (MPD), no detailed studies have been carried out to definitively confirm this suggestion. Our first purpose was to determine if embryos of six Korean species of Hosta (H. capitata, H. clausa, H. jonesii, H. minor, H. venusta and H. yingeri) grew inside the seeds prior to germination (i.e., were underdeveloped) or did not do so (i.e., were fully developed). Our second purpose was to identify the class of dormancy found in these seeds by examining germination during incubation at 15 and/or 25°C. The initial embryo : seed ratio in seeds of the six Hosta species was between 0.78 and 0.85, and embryos elongated by 9.6 to 17.5% prior to germination. Seeds of H. capitata, H. clausa, H. venusta and H. yingeri germinated to ≥65% in light and darkness at 15 and 25°C within 30 days, those of H. minor germinated to ≥80% in light and darkness at 25°C and to 24% in light and 50% in darkness at 15°C, and those of H. jonesii germinated to 100% in light at 25°C. We conclude that embryos in seeds of these six Hosta species are underdeveloped at maturity. Because high percentages of H. capitata, H. clausa, H. venusta and H. yingeri seeds germinated at cold and warm temperatures within 30 days, they have MD. On the other hand, seeds of H. minor germinated to high and low percentages at warm and cold temperatures, respectively. Thus, some seeds have MD and others may have MPD.

中文翻译:

韩国本土六种玉簪种子的胚胎生长和休眠

尽管有人推测玉簪种子具有发育不全的胚胎和形态 (MD) 或形态生理休眠 (MPD),但尚未进行详细研究以明确证实这一建议。我们的第一个目的是确定 6 种韩国玉簪(H. capitalata、H. clausa、H. jonesii、H. minor、H. venusta 和 H. yingeri)的胚胎在萌发前是否在种子内生长(即,欠发达)或没有这样做(即完全发达)。我们的第二个目的是通过检查 15 和/或 25°C 孵化期间的发芽情况,确定这些种子中发现的休眠类别。六种玉簪属植物种子的初始胚:种子比在 0.78 至 0.85 之间,胚在发芽前延长了 9.6 至 17.5%。H. capitata、H. clausa、H. venusta 和 H. yingeri 在 15°C 和 25°C 的光照和黑暗中在 30 天内萌发≥65%,H. minor 在 25°C 的光照和黑暗中萌发≥80%,在 25°C 的光照和黑暗中萌发率为 24%,在黑暗中发15°C,H. jonesii 在 25°C 光照下 100% 发芽。我们得出结论,这六种玉簪属植物种子中的胚胎在成熟时发育不全。因为高比例的 H.capitata、H. clausa、H.venusta 和 H. yingeri 种子在 30 天内在寒冷和温暖的温度下发芽,它们具有 MD。另一方面,H. minor 的种子在温暖和寒冷的温度下分别以高和低的百分比发芽。因此,一些种子具有 MD,而其他种子可能具有 MPD。H. jonesii 在 25°C 光照下 100% 发芽。我们得出结论,这六种玉簪属植物种子中的胚胎在成熟时发育不全。因为高比例的 H.capitata、H. clausa、H.venusta 和 H. yingeri 种子在 30 天内在寒冷和温暖的温度下发芽,它们具有 MD。另一方面,H. minor 的种子在温暖和寒冷的温度下分别以高和低的百分比发芽。因此,一些种子具有 MD,而其他种子可能具有 MPD。H. jonesii 在 25°C 光照下 100% 发芽。我们得出结论,这六种玉簪属植物种子中的胚胎在成熟时发育不全。因为高比例的 H.capitata、H. clausa、H.venusta 和 H. yingeri 种子在 30 天内在寒冷和温暖的温度下发芽,它们具有 MD。另一方面,H. minor 的种子在温暖和寒冷的温度下分别以高百分比和低百分比发芽。因此,一些种子具有 MD,而其他种子可能具有 MPD。次要在温暖和寒冷的温度下分别以高和低的百分比发芽。因此,一些种子具有 MD,而其他种子可能具有 MPD。次要在温暖和寒冷的温度下分别以高和低的百分比发芽。因此,一些种子具有 MD,而其他种子可能具有 MPD。
更新日期:2019-08-20
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