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accumulation ( Albrecht and Bowman 2008 ; Kim et al. 2009 ). A study by Schaffer et al. (1986) of citrus showed that starch accumulations can cause the disintegration of the chloroplast thylakoid system and decrease leaf chlorophyll levels. Downregulation of

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consequence of starch accumulation in citrus leaves affected by HLB may be an impact on photosynthesis. Light energy absorbed by chlorophyll molecules can be used to drive photosynthesis, dissipated as heat, or re-emitted as light (chlorophyll fluorescence

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1 Prescnt address: Himeji College of Hyogo, Shinzaike-honcho, Himeji, Hyogo 670 Japan. 2 To whom reprint requests should be addressed. Paper no. W of the series “Mechanism of Chlorophyll Degradation in Harvested Leafy Vegetables”. We gratefully

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Three chlorophyll deficiency traits in lettuce (Lactuca sativa) are reported. One, chlorophyll deficient-3 (cd-3), is quite yellow in the seedling stage, and controlled by a single recessive allele. Chlorophyll deficient-4 (cd-4) has sectors of yellow-green and green in the true leaves. It is inherited as a single recessive, and may be allelic to chlorophyll deficient-2 (cd-2). Sickly (si) is stunted, yellow, and partially necrotic, and is also controlled by a single allele. Virescent (vi) is epistatic to cd-4 and the latter is partially lethal. Linkage and additional epistatic relations with previously named chlorophyll deficient genes and other traits are discussed.

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Leaf chlorophyll content is an important index for plant N status, photosynthesis capacity, and stress tolerance ( Taiz et al., 2015 ). It is common to estimate leaf chlorophyll content using nondestructive optical chlorophyll meters ( Ferrarezi

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. Chlorophyll fluorescence and the photochemistry of photosystem II (PSII) can be imaged using cameras, sophisticated data capture techniques, and synchronized light sources ( Baker, 2008 ). Both baseline chlorophyll fluorescence and the Fv/Fm can be imaged and

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well as labor-intensive and time-consuming. More recently, chlorophyll fluorescence analysis has been used to evaluate plant responses to different environmental stresses ( Baker and Rosenqvist, 2004 ; Maxwell and Johnson, 2000 ). Chlorophyll

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Heat stress induces and accelerates leaf senescence, which is characterized by a loss of chlorophyll and cellular membrane deterioration, as well as oxidative damage ( Jespersen et al. 2016 ; Liu and Huang 2000 ; Yu et al. 2021a ). Leaf

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plays a role ( Han and Mukai, 1999 ; Ida, 1981 ). Plants have several mechanisms to cope with excess light during periods of low temperature when Calvin cycle activity is limiting, including reduction of chlorophyll, pH-dependent xanthophyll cycle

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assessment of N content of the tea plant is necessary for N fertilization. Traditional methods for chlorophyll and N determination include soil testing, plant tissue analysis, and long-term field trials. Although these methods are accurate, they are

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