杂草稻落粒粳的抗逆境特性研究

Stress-resistance of weedy rice Luolijing (Oryza sativa)

杂草稻落粒粳(Oryzasativa)发生在我国辽宁丹东.落粒粳植株明显高于当地大多数栽培品种,颖果呈中长型,成熟后容易掉粒;果壳稻草色或黄间黑灰色,小穗无芒或有芒,芒长4～12cm ;颖果千粒重2 . 35 g ,种皮桔红色.落粒粳种子在13～38℃条件下的发芽率均大于88% ,水层2 . 5～10cm处理,落粒粳植株干重减少5. 0 %～6 .9% .在幼苗期,落粒粳对无芒稗的各项影响因子均明显大于化感潜力品种I kung pao ,表明落粒粳无化感作用.落粒粳可以忍耐0. 5 %的盐碱.

Weedy rice Luolijing (Oryza sativa) is generated in Dandong,Liaoning Province of Northeast China.Its plant height is taller than normal planted rice varieties,and its caryopsis is medium or long in size,which dropped easily after matured.The color of the caryopsis shell is straw-like or yellow alternated with black-gray.The spikelet is with or without awns,and the length of the awns is 2～12 cm.The 1000 caryopsis weight is 23.5 g,and the hull is nacarat.The seed germination rate at 13～38 ℃ is > 88%.Under 2.5～10 cm water flooding,the plant dry weight reduced 50%～69%.At seedling stage,Luolijing had a stronger resistance capability against barnyardgrass (Echinochloa crusgalli var.mitis) than an alellopathic rice I-kung-pao,which meant that Luolijing had no allelopathic function.The Luolijing had a tolerance to 0.5% saline-alkaline solution.