盐胁迫对西藏3种野生披碱草属牧草种子发芽影响

Salt Stress on Three Wild Elymus Forages Germination of Tibet

为确定披碱草属(Elymus Linn.)3种优良牧草品种的耐盐能力,明确其耐盐浓度范围,试验设0%(对照)、0.4%、0.8%、1.2%、1.6%5个NaCl浓度水平,对3种披碱草属牧草(披碱草、老芒麦、垂穗披碱草)进行单盐胁迫。结果发现:不同的单盐浓度对3种野生牧草种子发芽的影响很大;随着盐浓度的增加,3种野生牧草种子的发芽率、发芽势、相对发芽率、萌发指数和活力指数不断下降;当盐浓度为1.6%时,披碱草、垂穗披碱草的发芽率、发芽势、萌发指数、相对盐害率等均为0,即种子萌发受到了完全抑制。结合指标综合评价,西藏3种牧草种子萌发期的耐盐性排序:老芒麦>垂穗披碱草>披碱草。初步判定,西藏野生老芒麦耐盐性最强,西藏野生披碱草耐盐性最差。

To determine the Elymus （Elymus Linn.） Three kinds salt tolerance of forage species, specifically its salt concentration range, set up to 0% of the experiment （CK） , 0.4%, 0.6%, 1.2%, 1.6%, five kinds NaCl concentration level of three Elymus forages （Elymus sibiricus, hanging nutans） single salt stress.The results showed that： very different salt concentrations in Tibet three wild forage seed germination; with increasing salt concentration, the Tibetan wild forage seed germination potential, relative germination rate, germination index and vigor index declining; when the salt concentration of 1.6%, the Elymus, Elymus grass germination potential, germination index, relative salt injury rate, all reached 0, that has been completely inhibited seed germination.Combined index comprehensive evaluation, Tibet three kinds of forage seed germination salt tolerance sorting： E.sibirieus 〉 Elymus nutans 〉 Elymus. Preliminary determination, Tibetan wild E.sibiricus Salt strongest.Tibetan wild Elymus Salt worst.