亚铁离子对水稻萌发后幼苗生长的促进作用

本文最新报道亚铁离子在远高于营养浓度的情况下（０．４４－７．１６ｍｍｏｌ／Ｌ）能显著促进水稻萌发后的幼苗生长，其效果与已报道的促进因子Ｃ２Ｈ４相当．在试验的１９种不同化合物中，发现只有ＦｅＳＯ４对萌发后水稻幼苗生长有显著的促进作用，并证明其有效成分为Ｆｅ（２＋）．这种促进作用在淹水的厌氧条件下和通气条件均能发生，但通气条件下促进程度稍低．水稻不同基因型对Ｆｅ（２＋）的反应无明显差异，可能这种促进作用是水稻适应水田厌氧环境的方式之一．高浓度乙烯（５０—１００ｐｐｍ）的促进作用与亚铁离子的效果相近．这一发现有助于提高水稻在淹水厌氧直播时的出苗率．－－ｓｉｇｎｉｆｉｃａｎｔａｔｌ％ｌｅｖｅｌ；＊－－ｓｉｇｎｉｆｉｃａｎｔａｔ５％ｌｅｖｅｌ；ｕｓ－－ｎｏｔｓｉｇｎｉｆｉｃａｎｔ．２．３ＥｆｆｅｃｔｏｆｖａｒｉｏｕｓＦｅ＋＋ｃｏｎｃｅｎｔｒａｈｏｎｓｏｎｔｈｅｓｅｅｄｌｉｎｇｇｒｏｗｔｈｏｆｒｉｃｅＴｗｏｇｅｎｏｔｙｐｅｓ，ｍｏｄｅｒｎＩＲ５０ａｎｄｔｒａｄｉｔｉｏｎａｌＡＳＤＩ，ｗｅｒｅｕｓｅｄｆｏｒｆｕｒｔｈｅｒｓｔｕｄｙ．Ｆｅ＋＋ｗｉｔｈｃｏｎｃｅｎｔｒａｔｉｏｎｓｆｒｏｍ０．４４ｔｏ７．１６ｍｍｏｌ／Ｌｗ

STIMULATION OF THE SEEDLING GROWTH OF RICE BY FERROUS ION

The paper reports a new finding that Fe++ with high concentrations (0.44-7.16mmol/L)is another effective stimulating factor other than the reported ones like CO2,ethylene,etc.Under submergence,4 out of 19 tested chemicals, at the same concentration of 1.79mmol/L,inhibited the seedling growth of rice, only FeSO4 significantly stimulated it, and the other ones had no effeCt. In aerobic condition,this stimulation still occur, but with a smaller extent. No obvious genotype difference was observed in the response to ferrous ion,which might imply that this stimulation behavior is one of the ways for rice to adapt flooded condition. High concentration of ethylene had a similar stimulative effect like Fe++ on the seedling growth of rice. This finding may probably help to improve the seedling establishment in the direct seeding, in which germinated seeds are sowed under flooded soil surface.