Chlorophyll fluorescence and leaf chlorophyll content of bean leaves injured by spider mites (Acari: Tetranychidae)

1995 ◽  
Vol 19 (10) ◽  
pp. 581-591 ◽  
Author(s):  
G. Iatrou ◽  
C. M. Cook ◽  
G. Stamou ◽  
T. Lanaras
Keyword(s):  
Chlorophyll Fluorescence ◽  
Chlorophyll Content ◽  
Spider Mites ◽  
Leaf Chlorophyll Content ◽  
Leaf Chlorophyll ◽  
Bean Leaves

Influence of N supply on development and dry matter accumulation of an old and a new maize hybrid

1994 ◽  
Vol 74 (3) ◽  
pp. 471-477 ◽  
Author(s):  
D. E. McCullough ◽  
M. Mihajlovic ◽  
A. Aguilera ◽  
M. Tollenaar ◽  
Ph. Girardin
Keyword(s):  
Chlorophyll Fluorescence ◽  
Chlorophyll Content ◽  
Dry Matter ◽  
Carbon Assimilation ◽  
Dry Matter Accumulation ◽  
Leaf Chlorophyll Content ◽  
Leaf Stage ◽  
Leaf Chlorophyll ◽  
N Supply ◽  
Leaf Chlorophyll Fluorescence

The response of an old and a new maize (Zea mays L.) hybrid to N supply was evaluated under controlled-environment conditions. An old hybrid (Pride 5) and a new hybrid (Pioneer 3902) were grown at three N levels (15, 2.5, and 0.5 mM N), and development and dry matter accumulation were measured at the 4-, 8-, and 12-leaf stage. Leaf chlorophyll was monitored from the 8- to 12-leaf stage, and leaf photosynthesis, stomatal conductance, and leaf chlorophyll fluorescence were measured at the 12-leaf stage. Rate of dry matter accumulation decreased with declining N supply. In contrast, decreasing N supply progressively increased the duration of the 4- to 8-leaf phase and the 8- to 12-leaf phase. As a consequence, total dry matter at the 12-leaf stage did not differ among N levels. The rate of leaf appearance of the old hybrid (Pride 5) was proportionately more reduced under low N than that of the new hybrid (Pioneer 3902). Similarly, the reduction in crop growth rate during the 8- to 12-leaf stage at the lowest N level was 46% for Pride 5 and 24% for Pioneer 3902. Leaf chlorophyll content was higher for Pride 5 than for Pioneer 3902 at high N levels, but leaf chlorophyll content declined significantly more rapidly in Pride 5 than in Pioneer 3902 when N stress increased. Leaf carbon assimilation rates were 4–27% higher for the new hybrid, with the largest differences occurring at low N levels. Collectively, results of this study show that the old hybrid (Pride 5) was more sensitive to N stress during early development than the new hybrid (Pioneer 3902). Key words:Zea mays L., nitrogen stress tolerance, chlorophyll content, photosynthesis, chlorophyll fluorescence

Effect of Branched Broomrape (Orobanche ramosa) Infection on the Growth and Photosynthesis of Tomato

Weed Science ◽  
2008 ◽  
Vol 56 (4) ◽  
pp. 574-581 ◽  
Author(s):  
Giovanni Mauromicale ◽  
Antonino Lo Monaco ◽  
Angela M. G. Longo
Keyword(s):  
Chlorophyll Fluorescence ◽  
Chlorophyll Content ◽  
Photosynthetic Rate ◽  
Carbon Assimilation ◽  
Parasitic Plants ◽  
Chlorophyll Fluorescence Parameters ◽  
Leaf Chlorophyll Content ◽  
Fluorescence Parameters ◽  
Growing Seasons ◽  
Leaf Chlorophyll

The influence of the holoparasite branched broomrape on the vegetative growth, leaf chlorophyll content, photosynthetic rate, and chlorophyll fluorescence of tomato was studied over two growing seasons on plants grown in a commercial greenhouse. The presence of the parasite strongly reduced the aerial biomass by acting as a competing sink for assimilate, but more importantly, by compromising the efficiency of carbon assimilation via a reduction in leaf chlorophyll content and photosynthetic rate. The chlorophyll fluorescence parameters F0, Fm, Fv, and Fv/Fm were all altered in parasitized plants, indicating that branched broomrape–infected plants are more susceptible to photoinhibition. The degree of damage to the host was not dependent on either the number or the biomass of parasitic plants per host plant. We suggest that the ability to maintain a high photosynthetic rate, leaf chlorophyll content, or both and the ability to minimize photoinhibition can be developed as indirect assays for improved tolerance to branched broomrape.

scholarly journals RIL-StEp: epistasis analysis of rice recombinant inbred lines (RILs) reveals candidate interacting genes that control seed hull color and leaf chlorophyll content

2021 ◽  
Author(s):  
Toshiyuki Sakai ◽  
Akira Abe ◽  
Motoki Shimizu ◽  
Ryohei Terauchi
Keyword(s):  
Chlorophyll Content ◽  
Recombinant Inbred ◽  
Complex Traits ◽  
Genetic Architecture ◽  
Recombinant Inbred Lines ◽  
Inbred Lines ◽  
Gene Interactions ◽  
Leaf Chlorophyll Content ◽  
Leaf Chlorophyll ◽  
Seed Hull

Abstract Characterizing epistatic gene interactions is fundamental for understanding the genetic architecture of complex traits. However, due to the large number of potential gene combinations, detecting epistatic gene interactions is computationally demanding. A simple, easy-to-perform method for sensitive detection of epistasis is required. Due to their homozygous nature, use of recombinant inbred lines (RILs) excludes the dominance effect of alleles and interactions involving heterozygous genotypes, thereby allowing detection of epistasis in a simple and interpretable model. Here, we present an approach called RIL-StEp (recombinant inbred lines stepwise epistasis detection) to detect epistasis using single nucleotide polymorphisms in the genome. We applied the method to reveal epistasis affecting rice (Oryza sativa) seed hull color and leaf chlorophyll content and successfully identified pairs of genomic regions that presumably control these phenotypes. This method has the potential to improve our understanding of the genetic architecture of various traits of crops and other organisms.

Variability of Leaf Chlorophyll Content in a Population of Sassafras

1990 ◽  
Vol 117 (2) ◽  
pp. 167 ◽  
Author(s):  
Amrita G. de Soyza ◽  
Dwight T. Kincaid ◽  
Carlos R. Ramirez
Keyword(s):  
Chlorophyll Content ◽  
Leaf Chlorophyll Content ◽  
Leaf Chlorophyll
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