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首页> 外文期刊>Nordic Journal of Botany >Germination response of four Arabian desert grasses to low water potential
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Germination response of four Arabian desert grasses to low water potential

机译：发芽反应四个阿拉伯沙漠草低水的潜力

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摘要

Species that can germinate under low water potential are likely to have greater utility for fodder production and restoration in arid habitats. We investigated seed germination response of four native grass species (Panicum acuminatum, Panicum turgidum; Pennisetum divisum and Polypogon monspeliensis) to five osmotic potentials (0, -0.3, -0.6, -0.9 and -1.2 MPa) using polyethylene glycol-6000 and two light treatments (0, 12 h light per day). All the studied species exhibited high germination (> 77%) at = 0 MPa except P. turgidum (42%). Polypogon monspeliensis seeds did not show any significant reduction in germination from = 0 to -0.3 MPa (90—83%), but all other species did, averaging from 75.8 to 60.5%. At = -0.6 MPa seed germination was reducedto around 20%. Germination of most species was unaffected by light, but P. divisum seeds that germinated in darkness were more tolerant to water deficit. Reduction of water potential to -0.3 MPa inhibited the germination timing for P acuminatum (ca 1.69days difference to 50% germination [t50]), P. divisum (ca 1.56 day) and P. monspeliensis (ca 1.14 days). Germination of P. acuminatum and P. monspeliensis were similar after stressful exposure to all osmotic potentials, while for P. divisum there was reduced germination (85% at -0.6 MPa to 58% -1.2 MPa), indicating a dormancy induction. Tolerance to low water potentials, and response after release from these low potentials, indicates the species are adapted to survive in drier environments.
机译：物种可以在低水位下发芽潜在的可能会有更大的效用饲料生产和修复在干旱栖息地。响应四个原生草地物种(黍和Polypogon monspeliensis)五渗透势(0、-0.3、-0.6、-0.9和-1.2 MPa)使用聚乙二醇- 6000和两个光治疗(0,12 h每天光)。研究物种表现出高萌发(>77%) = 0 MPa除了p turgidum(42%)。没有任何Polypogon monspeliensis种子显著减少发芽从= 0-0.3 MPa(90 - 83%),但所有其他物种,平均在75.8到60.5%。发芽是reducedto 20%左右。大多数物种的受光影响,但P。divisum种子发芽在黑暗中更加宽容的水赤字。-0.3 MPa抑制水潜力发芽时间P湿疣(ca 1.69天不同发芽[t50]) 50%, p . divisum1.56天(ca)和1.14 p . monspeliensis (ca天)。monspeliensis后被类似的压力接触所有的渗透势,而P。divisum发芽有减少(85%-0.6 MPa - 58% -1.2 MPa),表明一个休眠归纳。响应从这些低势释放后,表示物种适应生存干燥的环境。

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