Effects of long-term soil drought on photosynthesis and carbohydrate metabolism in mature robusta coffee (Coffea canephora Pierre var. kouillou) leaves
作者： Sidney C Praxedes , Fábio M DaMatta , Marcelo E Loureiro , Maria AG Ferrao , Antônio T Cordeiro
DOI: 10.1016/J.ENVEXPBOT.2005.02.008
关键词: Photosynthesis 、 Sucrose synthase 、 Botany 、 Sucrose-phosphate synthase 、 Biology 、 Chlorophyll fluorescence 、 Coffea canephora 、 Invertase 、 Stomatal conductance 、 Clone (cell biology) 、 Horticulture
摘要: Abstract Four clones of robusta coffee representing drought-tolerant (14 and 120) drought-sensitive (46 109A) genotypes were submitted to a slowly imposed water deficit. Sampling measurements performed when predawn leaf potential ( Ψ pd ) approximately −2.0 −3.0 MPa was reached. Regardless the clone evaluated, drought led sharper decreases in stomatal conductance than photosynthesis, which accompanied by significant declines internal ambient CO 2 concentration ratio. Little or no effect on chlorophyll fluorescence parameters observed. stress intensity, starch decreased remarkably. This not changes soluble sugars, with exception 120 rise sucrose hexose concentrations found reached −3.0 MPa. At = −2.0 MPa, activity acid invertase increased only 120; at = −3.0 MPa, it 14, 46 120, while synthase declined, but 109A. Drought-induced decrease ADP-glucose pyrophosphorylase 14 46, irrespective intensity. maximal extractable activation state sucrose-phosphate (SPS) all SPS maintained parallel rising fructose-1,6-bisphosphatase. Changes could neither be explained linked closure nor differences status.
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