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題 名 | 高溫逆境下青花菜之生理、組織結構變化及開花表現之研究=Physiological, Anatomy Structural and Flowering Changes of Broccoli under High Temperature Stress |
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作 者 | 陳葦玲; 蕭政弘; 蕭瑞展; | 書刊名 | 臺中區農業改良場研究彙報 |
卷 期 | 121 2013.12[民102.12] |
頁 次 | 頁9-24 |
分類號 | 435.234 |
關鍵詞 | 逆境; 光合作用; 抗氧化酵素; 解剖結構; 花球; Stress; Photosynthesis; Antioxidant enzyme; Anatomical structure; Flower head; |
語 文 | 中文(Chinese) |
中文摘要 | 臺灣夏季高溫造成青花菜花球品質不佳甚至不結花球,多仰賴進口以供應市場所需;因此本試驗以‘萬福’及‘清華’兩品種為材料,探討高溫逆境下青花菜生理變化,並觀察其組織結構差異性及開花表現,做為耐熱品種選育之參考。 40/35℃高溫逆境下,青花菜小苗光合作用速率、葉綠素螢光 Fv/Fm值及總葉綠素含量降低,反之蒸散速率、氣孔導度、過氧化氫含量、丙二醛含量及電解質滲漏率增加,抗氧化酵素 SOD, CAT及GR活性亦提高,其中Fv/Fm可作為耐熱篩選的生理指標,兩品種間以 ‘萬福’耐熱性較佳。在顯微結構觀察方面, ‘萬福’在40/30℃高溫處理 4天後,葉片下表皮葉肉細胞呈現輕微皺縮現象,但氣孔仍正常開合,且有較發達的維管束組織,反之 ‘清華’葉肉細胞則嚴重萎縮且氣孔亦失去功能。此外,花芽分化期高溫逆境均延遲兩參試品種到可見花球天數,並增加花球不平整鬆散、萼片葉片化及花蕾褐化敗育等畸形率,又以 ‘清華’影響較大,但對開花率及花球下葉片數則無顯著差異。 |
英文摘要 | In humid hot summer Taiwan, the marketing demand of Broccoli (Brassica oleracea L. var italica) relies on foreign imports due to its poor quality and low yield of flower head in local produce. For developing heat tolerant bred, the aim of this study was to investigate the physiological, micro-structural and flowering changes under heat stress.The seedlings of two tested broccoli cultivars of ‘WenFo’ and ‘ChingHua’were measured. Results showed that characters of photosynthetic rate, chlorophyll inflorescence (Fv/Fm), and total chlorophyll content were decreased under 40/35oC condition, but the activities of transpiration rate, stomata conductance, hydrogen peroxide (H2O2) content, malondialdehyde (MDA) content, antioxidant enzyme activity of SOD, CAT and GR were increased. The Fv/Fm measure was found to be a useful physiological index for heat tolerant selection and ‘WenFo’ performed better heat tolerant capacity. From micro-structural observation, as compared with ‘ChingHua’, ‘WenFo’ showed slightly shrinkage in lower epidermis mesophyll cell, more active in stomata function, and well development in vascular bundle tissue in which treated under 40/35oC for 4 days long. In addition, heat stress during flower differentiation stage could delay the date to visible flower head and increase the character of uneven flower head appearance, head loosing, abnormal growth in petall and flower bud formation. However, the high temperature stress did not significantly impact the flowering rate and leaf development in lower shoot. |
本系統中英文摘要資訊取自各篇刊載內容。