缺水逆境對芥藍生理特性之影響

許珮芬

doi:10.6346/NPUST.2013.00297

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缺水逆境對芥藍生理特性之影響

Effects of drought stress on physiological properties of Chinese kale

許珮芬 , Masters　　Advisor：蔡秀隆　　

繁體中文 DOI： 10.6346/NPUST.2013.00297

缺水逆境；芥藍； SPAD值；光合作用；脯胺酸； Drought stress ； Brassica oleracea var. alboglabra ； SPAD value ； photosynthesis ； proline

Abstract │ Reference (101) │ Times Cited (50) │ Altmetrics

Abstract 〈TOP〉

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Chinese kale (Brassica oleracea var. alboglabra) is a vegetable from the Brassicacea family and is widely consumed in Asian cuisine. It can be plant for all year round. Chinese kale is shallow rooted plant, prompt to water lose which would influence its yield and quality. Because of the global climate change, the effects of drought on agricultural losses have become an important issue. In this study, we will discuss how water deficit affects the yield and physiological properties of Chinese kale. Four white flower varieties Chinese kale, Veg-Gin (V1), Full White (V2), New Veg-Gin (V3), and Green Delicacy (V4) were used. The drought stress (DS) caused by water deficit was below 50% field capacity and also plant was wilting, on the other hand, the control one (CK) was higher 80% field capacity. According to the results of chlorophyll (SPAD value) and biomass, two varieties were chosen to study in more detail; the physiological properties including relative water content (RWC), photosynthesis, electrolyte leakage (EL), and proline content. Also, oxygen radical absorbance capacity (ORAC) was analysed.
It was found that there was higher SPAD value in Green Delicacy and lower in Veg-Gin. At drought stage, SPAD value of DS was significantly higher than CK; furthermore, SPAD value of upper leaf increased more than lower leaf. At harvest stage, fresh (dry) weight of Veg-Gin, Full White, New Veg-Gin, and Green Delicacy of DS compared to CK were decreased individually 38.09% (41.05%), 27.65% (29.91%), 29.56% (33.70%), and 30.90% (33.15%). Thus, Veg-Gin and Full White were chosen to study the physiological properties and ORAC under drought stress. At drought stage, RWC and photosynthesis of DS compared to CK were significantly decreased; on the contrary, EL, proline content, and ORAC were significantly increased. All of the physiological properties were no significant difference between Veg-Gin and Full White at upper leaf; however, at lower leaf, photosynthesis was no significant difference between Veg-Gin and Full White, but in Veg-Gin of DS decreased more than Full White of DS; moreover, proline content in Veg-Gin of DS was significant lower than Full White of DS. At harvest stage, at lower leaf, SPAD value of CK was no significant difference between Veg-Gin and Full White; however, of DS, Veg-Gin was significant lower than in Full White. All of the physiological properties were no significant difference between all treatment except that photosynthesis in Veg-Gin of DS was significantly higher than others.
The effects of drought stress on physiological properties in Chinese kale were evident, and drought stress made biomass lose. Proline can reduce photosynthetic system damage under water stress, and provide energy after rehydrate; Leaf senescence correlates closely with photosynthesis decline. Thus, in this study, we surmise that the different yield loss between Veg-Gin and Full White after drought stress may be related to the proline accumulation, photosynthesis abilities, and chlorophyll reducing namely leaf-yellowing at lower leaf in plant. The effect of drought stress on Chinese kale leaves showed spatio-temporal heterogeneity. Therefore, we can have further leaf-position experiment to understand the whole physiological properties of plant in the future.

Reference ( 101 ) 〈TOP〉

王至正 (2006) 以氧自由基吸收能力法(ORAC)測定園產品之抗氧化能力。國立臺灣大學園藝學研究所碩士論文。
連結：
王俊豪、湯凱崴 (2011) 歐盟農業氣候區劃分與氣候變遷潛在影響評估。農業推廣文彙 56: 268-281。
連結：
王婕妤 (2012) 臺灣地區區域降雨總量及極端降雨與乾旱之變遷特性。中央大學土木工程學系碩士論文。
連結：
張嘉滿、高景輝、王自存 (2007) 乙烯誘導芥藍葉片老化過程中之抗氧化反應。臺灣園藝 53: 427-440。
連結：
張榮傑 (2013) 氣候變遷對農業生產影響。中興大學應用經濟學系所博士論文。
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