Inhibition of Abscisic Acid Accumulation in Seedling Shoots of Pearl Millet (Pennisetum americanum [L.] Leeke) Following Induction of Chlorosis by Norflurazon

Zeitschrift für Pflanzenphysiologie Pub Date : 1984-03-01 DOI:10.1016/S0044-328X(84)80076-8

I.E. Henson

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引用次数: 51

Abstract

Shoots from four-day old light-grown pearl millet (Pennisetum americanum [L.] Leeke) seedlings, grown continuously in the presence of 1.32 × 10^-5M norflurazon (NF), lacked chlorophyll and failed to accumulate abscisic acid (ABA) when water stressed. Chlorophyll and stress-induced ABA contents were significantly correlated (r = 0.82, P<0.001) for seedling shoots treated with a range of NF concentrations.

No inhibitory effect on ABA accumulation by NF occurred if seedlings were grown at low light intensity (<20 μmol m^-2 s^-1 photosynthetic photon flux density), or if NF was applied 3 days after sowing to already greened seedlings. Neither was ABA accumulation affected by the related non-bleaching compound, SAN 9785.

The results suggest that norflurazon had no «direct» effect on ABA accumulation. The possibility that structurally and functionally intact chloroplasts are required for this process is discussed.

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珍珠粟(Pennisetum americanum)苗木脱落酸积累的抑制作用[j]。[Leeke])去氟拉唑诱导褐变

4龄光生珍珠粟(Pennisetum americanum) [L.]在1.32 × 10-5M去氟唑松(NF)处理下连续生长的Leeke幼苗，在水分胁迫下缺乏叶绿素，且脱落酸(ABA)不能积累。在一定浓度的NF处理下，叶绿素含量与胁迫诱导的ABA含量呈显著相关(r = 0.82, P<0.001)。在低光强(<20 μmol m-2 s-1光合光子通量密度)和播后3 d施用NF对ABA积累无抑制作用。ABA积累也不受相关非漂白化合物SAN 9785的影响。结果表明，去氟拉松对ABA积累没有“直接”影响。讨论了该过程需要结构和功能完整的叶绿体的可能性。

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