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Leaf Chlorophyll (leaf + chlorophyll)

Distribution by Scientific Domains
Life Sciences50%

Terms modified by Leaf Chlorophyll

  • leaf chlorophyll content
    		•

    Selected Abstracts

    Effects of Moisture Stress and Anti-transpirants on Leaf Chlorophyll,

    JOURNAL OF AGRONOMY AND CROP SCIENCE, Issue 3 2000
    M. Prakash
    Brinjal plants (Solanum melongena L.) grown under moisture stress conditions in a glasshouse were treated with three anti-transpirants, namely cycocel, limewash and potassium chloride, to study their influence on chlorophyll content, soluble protein and photosynthetic rate. Moisture stress imposed at each of the three growth stages decreased chlorophyll content, soluble protein and photosynthetic rate. Of the anti-transpirants investigated, cycocel performed better than limewash and po-tassium chloride. Zusammenfassung Eierfruchtpflanzen (Solanum melongena L.), die unter Feuchtigkeitsstre ßbedingungen im Glashaus angezogen wurden, wurden mit drei Transpirationshemmern: Cycocel, Kalkbrühe und Kaliumchlorid behandelt, um deren Einfluß auf Chlorophyllgehalt, lösliches Protein und Photosyntheserate zu untersuchen. Feuchtigkeitsstreß in drei Entwicklungsstadien führte zur Abnahme von Chlorophyll,-löslichem Protein und Photosyntheserate. Von den Transpirationshemmern erwies sich Cycocel besser als Kalkbrühe und Kaliumchlorid. [source]

    Phosphorus alleviates aluminum-induced inhibition of growth and photosynthesis in Citrus grandis seedlings

    PHYSIOLOGIA PLANTARUM, Issue 3 2009
    Huan-Xin Jiang
    Limited data are available on the effects of phosphorus (P) and aluminum (Al) interactions on Citrus spp. growth and photosynthesis. Sour pummelo (Citrus grandis) seedlings were irrigated for 18 weeks with nutrient solution containing 50, 100, 250 and 500 ,M KH2PO4× 0 and 1.2 mM AlCl3· 6H2O. Thereafter, P and Al in roots, stems and leaves, and leaf chlorophyll (Chl), CO2 assimilation, ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) and Chl a fluorescence (OJIP) transients were measured. Under Al stress, P increased root Al, but decreased stem and leaf Al. Shoot growth is more sensitive to Al than root growth, CO2 assimilation and OJIP transients. Al decreased CO2 assimilation, Rubisco activity and Chl content, whereas it increased or did not affect intercellular CO2 concentration. Al affected CO2 assimilation more than Rubisco and Chl under 250 and 500 ,M P. Al decreased root, stem and leaf P, leaf maximum quantum yield of primary photochemistry (Fv/Fm) and total performance index (PItot,abs), but increased leaf minimum fluorescence (Fo), relative variable fluorescence at K- and I-steps. P could alleviate Al-induced increase or decrease for all these parameters. We conclude that P alleviated Al-induced inhibition of growth and impairment of the whole photosynthetic electron transport chain from photosystem II (PSII) donor side up to the reduction of end acceptors of photosystem I (PSI), thus preventing photosynthesis inhibition through increasing Al immobilization in roots and P level in roots and shoots. Al-induced impairment of the whole photosynthetic electron transport chain may be associated with growth inhibition. [source]

    Stay green trait in grain sorghum: relationship between visual rating and leaf chlorophyll concentration

    PLANT BREEDING, Issue 4 2000
    W. Xu
    Abstract Post-flowering drought tolerance is referred to as the stay green trait in sorghum. Plants with stay green resist drought-induced premature plant senescence. In breeding programmes, stay green is evaluated under limited irrigation, post-flowering moisture-stress field conditions and visually scored at or soon after physiological grain maturity. The objective of this study was to investigate the relationship between the stay green rating and total leaf chlorophyll content. The parents B35 and Tx7000, and their 98 F, recombinant inbred lines were evaluated in replicated field trials under limited (post-flowering stress) and full-irrigation (non-stress) conditions. After scoring the stay green trait of stressed plants, total leaf chlorophyll contents were measured with a chlorophyll meter (SPAD values) and a spectrophotometer method. The SPAD value had a significant linear relationship with total leaf chlorophyll (R2= 0.91) and with visual stay green rating (with R2= 0.82). Relative water content in top leaves of the stay green lines was about 81%, much higher than non-stay green lines (38%), indicating that the stay green lines kept the stalk transporting system functioning under severe drought conditions, The results indicate that visual stay green ratings were a reliable indicator of leaf senescence an should be useful to sorghum breeders in evaluating progeny when breeding for drought tolerance. [source]

    Changes in 13C/12C of oil palm leaves to understand carbon use during their passage from heterotrophy to autotrophy,

    RAPID COMMUNICATIONS IN MASS SPECTROMETRY, Issue 16 2009
    Emmanuelle Lamade
    The carbon isotope composition of leaf bulk organic matter was determined on the tropical tree Elaeis guineensis Jacq. (oil palm) in North Sumatra (Indonesia) to get a better understanding of the changes in carbon metabolism during the passage from heterotrophy to autotrophy of the leaves. Leaf soluble sugar (sucrose, glucose and fructose) contents, stomatal conductance and dark respiration, as well as leaf chlorophyll and nitrogen contents, were also investigated. Different growing stages were sampled from leaf rank ,6 to rank 57. The mean values for the ,13C of bulk organic matter were ,29.01,±,0.9, for the leaflets during the autotrophic stage, ,27.87,±,1.08, for the petioles and ,28.17,±,1.09, for the rachises, which are in the range of expected values for a C3 plant. The differences in ,13C among leaf ranks clearly revealed the changes in the origin of the carbon source used for leaf growth. Leaves were 13C-enriched at ranks below zero (around ,27,). During this period, the ,spear' leaves were completely heterotrophic and reserves from storage organs were mobilised for the growth of these young emerging leaves. 13C-depletion was then observed when the leaf was expanding at rank 1, and there was a continuous decrease during the progressive passage from heterotrophy until reaching full autotrophy. Thereafter, the ,13C remained more or less constant at around ,29.5,. Changes in sugar content and in ,13C related to leaf ranks showed an interesting similarity of the passage from heterotrophy to autotrophy of oil palm leaves to the budburst of some temperate trees or seed germination reported in the literature. Copyright © 2009 John Wiley & Sons, Ltd. [source]