頁籤選單縮合
題名 | 野鴉椿種子可儲性與解除休眠處理之研究=Storability and Treatments to Overcome Dormancy of Sweetheart Tree (Euscaphis Japonica (Thunb.)Kanitz) Seeds |
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作者 | 楊正釧; 郭幸榮; 林讚標; | 書刊名 | 臺灣林業科學 |
卷期 | 20:2 2005.06[民94.06] |
頁次 | 頁179-192 |
分類號 | 436.251 |
關鍵詞 | 野鴉椿; 種子可儲性; 乾儲型; 層積; 組合層積; Sweetheart tree; Euscaphis japonica; Seed storability; Orthodox; Chilling; Combined stratification; |
語文 | 中文(Chinese) |
中文摘要 | 本研究目的在找出解除野鴉椿種子休眠的處理並探討其儲藏性質。1999年採於台北市陽明山(北緯25°10’;東經121°33’;海拔高度420 m)的野鴉椿新鮮種子分別以30/20℃(8 h光照)和35/10℃(8 h光照)二種變溫條件發芽20週後僅得0.3與26.8%之發芽率,且未發芽種子多未敗壞仍呈休眠狀態。本批種子經組合層積(如下所述)完全解除休眠後評估其起始發芽率為92.1±4.2%。以4℃層積、磨傷、25% H2O2浸蝕10~120 min、98% H2SO4浸蝕5~120 min、2000 ppm GA3浸泡15 h、磨傷後再以2000 ppm GA3浸泡15 h等處理均無法有效打破種子休眠。4℃層積經3~5 mo後以30/20℃變溫發芽能使種子發芽率提高到49.3~71.3%,但隨低溫層積時間之延長種子開始衰敗,8 mo後種子完全喪失活力,故建議不宜以低溫濕藏來對本種種子進行短期儲藏。種子先經3 mo的30/20℃暖變溫層積再轉入4℃層積2 mo之組合層積作業能完全打破種子休眠;新鮮種子乾燥至4.2±0.4、5.8±0.4、8.6±0.3、10.9±0.5與17.2±1.4%含水率(鮮重),隨即以此法解除休眠後所得之發芽率分別是89.5±4.3、92.0±2.0、89.5±4.3、93.5±3.0與96.0±2.4%。本種種子含水率降低至4.2~10.9%儲藏於-20、4與15℃時,經24 mo後其發芽率並無顯著下降,故判定其種子儲藏性質屬乾儲型。 |
英文摘要 | The objectives of this study were to determine effective dormancy-breaking treatments and to investigate the storage behavior of seeds of the sweetheart tree (Euscaphis japonica). The germination percentages of freshly collected mature seeds of sweetheart tree from Yangmingshan, Taipei (25°10’N, 121°33’E; elevation, 420 m) in 1999 were 0.3 and 26.8% under alternating temperatures 30/20℃ with 8 h of light and 35/10℃ with 8 h of light, respectively, for 20 wk. Most of the ungerminated seeds remained dormant after a 20-wk incubation. After a combined 3-mo warm and 2-mo cold stratification, the true initial germination percentage of this seedlot was 92.1±4.2%. The following treatments were also found to be ineffective: 4℃ chilling alone, mechanical scarification, chemical scarification (pre-soaking in 25% H2O2, or pre-soaking in 98% sulfuric acid), 15 h of pre-soaking in 2000 ppm GA3, and soaking in GA3 for 15 h after mechanical scarification. Significant increases in seed germination (49.3~71.3%) were obtained after chilling at 4℃ for 3~5 mo and incubating under alternating temperatures of 30/20℃, whereas all seeds deteriorated when chilling was extended to 8 mo. Therefore, cold, wet conditions for a short-term storage are not recommended for sweetheart tree seeds. The dormancy of sweetheart tree seeds, however, can effectively be broken by a combination of warm stratification at 30/20℃ for 3 mo followed by cold stratification at 4℃ for 2 mo. Freshly mature seeds that were dried to moisture contents of 4.2±0.4, 5.8±0.4, 8.6±0.3, 10.9±0.5, and 17.2±1.4% (on a fresh-weight basis) and treated with the combined stratification had germination percentages of 89.5±4.3, 92.0±2.0, 89.5 ±4.3, 93.5±3.0, and 96.0±2.4%, respectively. Seed germinability could be maintained at -20, 4, and 15℃, for at least 24 mo at moisture contents of 4.2~10.9%, therefore, confirming the orthodox seed storage behavior of sweetheart tree seeds. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。