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題名 | 氣溫與根溫對開運竹生長與發根之影響=Effects of Air and Root Temperatures on Growth and Rooting of Dracaena Sanderiana ‘Virens’ |
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作者 | 林曉君; 葉德銘; | 書刊名 | 臺灣園藝 |
卷期 | 52:4 民95.12 |
頁次 | 頁441-448 |
分類號 | 435.13 |
關鍵詞 | 氣溫; 根溫; 底部加熱; 莖幹插穗; 龍血樹屬; Air temperature; Root temperature; Bottom heat; Cane cuttings; Dracaena; |
語文 | 中文(Chinese) |
中文摘要 | 本研究探討氣溫與根溫對開運竹發根與生長之影響。將開運竹植株移入人工氣候室,不同日/夜溫處理3個月後,枝梢長度與葉片生長均以25/20℃處理者最佳,而低溫15/13℃處理者最差。高溫35/30℃處理者不利枝梢生長與葉乾重累積。將植株去頂後5週,以35/30℃、30/25℃與25/20℃處理者皆萌發側芽,但20/15℃與15/l3℃處理者采萌發。冬季種植之莖幹插穗,底部加熱至25℃或29℃者,經2週後開始發根;而無底部加熱之對照組(根溫18℃)則至6週後開始發根。經處理10週後,以25℃與29℃根溫處理之根乾重、根數與根長均較對照組多,且莖幹之第3與第4節的側芽多可萌發,但對照組僅於第1與第2節萌發側芽。冬季不增加氣溫而僅增加根溫至25℃處理4至6週,可使開運竹莖幹插穗有較佳之發根與萌芽率。 |
英文摘要 | Effects of air and root temperatures on rooting and growth were studied in Dracaena sanderiana 'Virens'. Plants were moved to phytotrons with different day/night temperatures for three months. Maximum shoot length and leaf growth were recorded in plants under 25/20℃, while minimum leaf number and leaf chlorosis was found in plants under 15/13℃. The high temperature of 35/30℃ treatment decreased shoot length and leaf dry weight. Lateral buds sprouted in plants with decapitated shoots under higher temperatures of 35/30℃ ,30/25℃ or 25/20℃ for five weeks, while no lateral bud outgrowth was visible in those under 20/15 or 15/13℃. In natural winter greenhouse conditions, rooting started in cane cuttings with bottom heat to 25 or 29℃ after two weeks,as compared to rooting with the unheated control (18℃ root temperature) after six weeks. Cane cuttings had more root dry weight, root number and root length in the 25℃ or 29℃ root temperature treatments than the unheated control. The 25℃ or 29℃ root temperatures could trigger lower lateral buds outgrowth (3 to 4 from top),as compared to only lateral buds 1 to 2 outgrowth in cuttings without bottom heat. Root zone heating at 25℃ for four to six weeks resulted in higher rooting and shoot sprouting than those at 29℃ or unheated control and would allow growers to reduce fuel costs by heating the greenhouse air volume. |
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