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No.35 (1988/12) >

Title :水分ストレスがストレス解除後のサトウキビの乾物生産特性に及ぼす影響(農学部附属農場)
Title alternative :After-effects of water stress on matter production process of sugar cane (Saccharum officinarum L.) at early growth stage (Agricultural Experiment Station)
Authors :仲間, 操
野瀬, 昭博
江橋, 賢治
宮里, 清松
村山, 盛一
Authors alternative :Nakama, Misao
Nose, Akihiro
Ebashi, Kenji
Miyazato, Kiyomatsu
Murayama, Seiichi
Issue Date :5-Dec-1988
Abstract :サトウキビ品種NCo310を用い, 土壌水分欠乏が給水制限解除後の乾物生産特性に及ぼす影響を調査した。植付け後77日目のサトウキビをpF2.5,3.5,3.8,4.2の土壌水分下で2週間にわたって育て, その後土壌水分をpF2.5に維持したときの生育の様相を22日間にわたって追跡調査した。得られた結果の概要は以下の通りである。1)pF4.2区では生育の回復は殆ど認められなかった(図1,2,3,4)。2)pF3.8区とpF3.5区では水分処理解除後に茎重や葉重について顕著な回復を示し(図3), 特にpF3.8区では最上位完全展開葉々位の増加や青葉数などの葉身形質に回復現象がみられた(図2)。3)土壌水分処理解除後, 相対生長率(RGR)はpF3.8区で高かった。また, pF3.8区の高いRGRは高い純同化率(NAR)によっていることが推察された(表1)。4)土壌水分処理解除後のRGRの回復は, 同化器官の量(LWR)よりもNARの増加によっていることが明らかになった。更に, その時のRGRやNARは梢頭部の含水率と高い負の相関を示した(表2)。
Using sugar cane (Saccharum officinarum L. c. v. NCo 310), the effects of soil moisture deficit on characteristics of matter production process after releasing the restriction of water supply were examined. Young sugar cane plants of the 77th day after planting were experienced for two weeks under soil moisture conditions of pF 2.5,3.5,3.8,and 4.3. After the treatments, the time courses of matter production process were investigated for 22 days, re-setting the soil moisture to pF 2.5. The following results were obtained : After re-setting to enough soil moisture condition, the growth of pF 4.2 block could not recover (Fig. 1,2,3,and 4). At blocks of pF 3.5 and pF 3.8,however, the dry weight of stalk and leaves were recovered sufficiently after re-watering (Fig. 3). Especially, leaf position of upper most full expanded leaf and number of leaves were recovered rapidly at block of pF 3.8 (Fig. 2). After re-watering, relative growth rate (RGR) of whole plant included roots showed high at block of pF 3.8. It was appeared that these high RGR were resulted from high net assimilation rate (NAR) (Table 1). In this study, RGR and NAR after re-watering showed high negarive correlations to mean water contents of spindle (Table 2).
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/3899
Citation :琉球大学農学部学術報告 = The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus no.35 p.113 -120
Appears in Collections:No.35 (1988/12)

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