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T. Casey Barickman, Dean A. Kopsell, and Carl E. Sams

( Nicotiana tabacum ), beet ( Beta vulgaris ), and corn ( Zea mays ) pre-treated with ABA demonstrated increased chlorophyll and carotenoid concentrations under water stress. Sorghum ( Sorghum bicolor ) seedlings supplemented with ABA and exposed to light

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Youngsuk Lee, Hun Joong Kweon, Moo-Yong Park, and Dongyong Lee

the main component of chlorophyll [Chl ( Hák et al., 1993 )]; therefore, estimating the plant N content is important for farmers to determine the amount of N fertilizer needed for optimum nutrient management, especially for apple trees younger than 5

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Peter M.A. Toivonen

Chlorophyll “a” fluorescence (Fvar) was compared with respiration and vitamin C content of broccoli [Brassica oleracea L. (Botrytis group)] during storage at 1C. The amplitude of the Fvar maxima declined in a similar manner as respiration and vitamin C content. Fvar was highly correlated with respiration (r = 0·83, P > = 0·0001). The correlation of Fvar with vitamin C content was weaker (r = 0·42, P > = 0·0002). The results demonstrate that Fvar is an indicator of postharvest changes in broccoli and that Fvar can be used as a nondestructive indicator of early changes in tissue condition (i.e., degree of freshness) of broccoli in storage.

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Madhulika Sagaram and Jacqueline K. Burns

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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Naoki Yamauchi and Alley E. Watada

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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Edward J. Ryder

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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D. Michael Glenn

. 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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Ji-Jhong Chen, Shuyang Zhen, and Youping Sun

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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María A. Equiza and David A. Francko

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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Ryan N. Contreras, John M. Ruter, James S. Owen Jr., and Andy Hoegh

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