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在营养液水培条件下,研究了不同Zn~(2+)活度（pZn~(2+)9.7,pZn~(2+)11.0和pZn~(2+)>11.5）对水稻根叶的生长发育和若干生理特性的影响。结果表明:低Zn~(2+)活度下,对水稻秧苗的出叶速度减慢,但不同基因型间存在明显差异,极度缺锌（pZn~(2+)>11.5）时,敏感品种只生长3.5叶,而耐低锌品种生长4.5叶左右;轻度缺锌或缺锌初期叶绿素含量上升和根系氧化力下降,严重缺锌,则叶绿素含量显著降低,根系氧化力明显增加,且敏感品种比耐缺锌品种的变化更为明显。低Zn~(2+)活度增加地下部干物质的积累,pZn~(2+)从9.7下降到11.0,耐低锌品种的地上部干重虽下降,但因地下部干重显著增加,故总干重相近,锌敏感品种则地上部干重显著下降,而地下部干重增加不明显,所以总干重显著下降。严重缺锌（pZn~(2+)>11.5）时,所有供试水稻品种的干重均极显著地下降,敏感品种比耐低锌品种下降得更多。因此,缺锌条件下的秧苗出叶速度和干物质积累可作为筛选和鉴定耐缺锌品种的有效指标,pZn~(2+)11.0可能是一个筛选锌高效基因型的临界锌离子活度。
Under the condition of nutrient solution hydroponics, the effects of different Zn 2+ activities (pZn 2+, pZn 2+ and pZn 2+) on root and leaf of rice Growth and development and several physiological characteristics. The results showed that the leaves of rice seedlings were slowed down under low Zn 2+ activity, but there were significant differences among different genotypes. When zinc deficiency (pZn ~ (2 +)> 11.5) Only grew 3.5 leaves, but low-zinc varieties grew about 4.5 leaves; chlorophyll content and root oxidative capacity decreased slightly in the early stage of zinc deficiency or zinc deficiency; while in the case of severe zinc deficiency, the chlorophyll content decreased significantly and the root oxidative stress increased obviously and was sensitive Varieties more resistant than zinc-resistant varieties more obvious changes. Low Zn 2+ activity increased the accumulation of underground dry matter, pZn ~ (2+) decreased from 9.7 to 11.0, although the shoot dry weight of low Zn tolerant cultivars decreased, but the dry weight of the lower part significantly increased, Therefore, the total dry weight is similar to the zinc-sensitive varieties of the aboveground dry weight decreased significantly, while the dry weight of the underground increase is not obvious, so the total dry weight decreased significantly. In severe zinc deficiency (pZn ~ (2 +)> 11.5), the dry weight of all the tested rice cultivars decreased significantly, and the susceptible cultivars decreased more than those of low resistant varieties. Therefore, seedling emergence speed and dry matter accumulation under zinc deficiency could be used as effective indicators for screening and identifying zinc-tolerant varieties. PZn ~ (2+) 11.0 may be a critical zinc ion activity for screening zinc-efficient genotypes.