VARIETAL DIFFERENCE OF PHYSICAL CHARACTERISTICS OF THE CULM RELATED TO LODGING RESISTANCE IN PADDY RICE
VARIETAL DIFFERENCE OF PHYSICAL CHARACTERISTICS OF THE CULM RELATED TO LODGING RESISTANCE IN PADDY RICE
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DOI：
10.1626/jcs.61.419
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发表时间：
1992-09-01
影响因子：
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通讯作者：
ISHIHARA, K
中科院分区：
文献类型：
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作者：
OOKAWA, T;ISHIHARA, K
使用 9 个日本品种和 13 个外国品种（cv. Kamenoo : KA、Aikoku : AK、Koshihikari : KO、Dobashi 1 : DO、Fujiminori : FU、Reimei : PE、Nipponbare : NI、Musashikogane : MU、Akenohoshi : AK，中国 117 : Cl 17, 台中 189 : T189, 台农 67 : T67, 巴伊亚: BAH, 巴利拉 : BAL, M-302: M302, 柠檬 : LE, 蓝帽 : BB, 真力时: ZE, 捷豹 : JA, Arborio : AR, 密阳 23 : M23, 南京 11 : N11).日本长秆品种更容易受到 与国外品种相比，抗倒性较差，因为断裂强度（即折断带有叶鞘的主秆基部（自上数第5个）节间所需的最小力）要小得多，为1000～1200克。相反，一些长秆和短秆品种直到收获后才倒伏，因为这些品种在灌浆期基部节间带叶鞘的断裂强度较大，可达2100～2600g。不同品种带叶鞘秆断裂强度不同的原因如下。日本品种由于叶鞘枯死较早，叶鞘覆盖对秆的加固程度较小，基部节间断裂强度也较国外品种小。台中189、台农67、中国117、明之星和密阳23表现出基部节间较高的断裂强度，主要是由于叶鞘覆盖、基部节间截面面积大、基部节间弯曲应力大而增强。与越光相比，明之星由于叶鞘覆盖，基部节间断裂强度增加了一倍，而密阳23由于基部节间截面面积较大，断裂强度增加了三倍。
Varietal difference of lodging resistance in paddy rice was studied using nine Japanese cultivars and thirteen foreign cultivars (cv. Kamenoo : KA, Aikoku : AK, Koshihikari : KO, Dobashi 1 : DO, Fujiminori : FU, Reimei : PE, Nipponbare : NI, Musashikogane : MU, Akenohoshi : AK, Chugoku 117 : Cl 17, Taichung 189 : T189, Tainung 67 : T67, Bahia: BAH, Ballila : BAL, M-302: M302, Lemont : LE, Blue Bonnet : BB, Zenith: ZE, Jaguary : JA, Arborio : AR, Milyang 23 : M23, Nanjing 11 : N11).Japanese long culm cultivars were more susceptible to lodging compared with foreign cultivars, because the breaking strength which indicated the minimum force required to break the basal (the 5th from the top) internode of the main culm with leaf sheaths was much smaller, ranging from 1000 to 1200 g. On the contrary, some long and short culm cultivars did not lodge until the harvest, because these cultivars maintained the large breaking strength of the basal internode with leaf sheaths during grain filling period, ranging from 2100 to 2600 g.The reasons why the breaking strength of the culm with leaf sheaths was different among the cultivars were as follows. In Japanese cultivars, as leaf sheath died down earlier, the degree to which the culm was reinforced by leaf sheath covering was smaller, and the breaking strength of the basal internode was also smaller compared with those of foreign cultivars. Taichung 189, Tainung 67, Chugoku 117, Akenohoshi and Milyang 23 showed the high breaking strength of the basal internode which was mainly based on reinforcement due to leaf sheath covering, the large area of the basal internode cross section and the large bending stress in the basal internode. Approximately, the increase of the breaking strengh of the basal internode was doubled due to leaf sheath covering in Akenohoshi, and was tripled due to the larger area of the basal internode cross section in Milyang 23, as compared with that of Koshihikari, respectively.