Download or read book Changes in the photosynthetic light response curve during leaf development of field grown maize with implications for modelling canopy photosynthesis written by C M. Stirling and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Changes in the photosynthetic light-response curve during leaf development were determined for the fourth leaf of maize crops sown on 23 April and 10 June. Temperatures were unusually mild during late spring/early summer and neither crop experienced chilling damage. The concept of thermal time was used to take into account the effects of different temperature regimes on developmental stage, thereby enabling photosynthetic light-response data to be combined for both crops to describe the general response. Large variations in the upper asymptote (A(sat)) and convexity (Theta) of the light- response curve occurred during leaf development, but the maximum quantum yield of CO2 assimilation remained relatively constant throughout. Dark respiration rates showed a small but significant decrease with leaf age and generally ranged between 5 and 10% of A(sat). A simple mathematical model was developed to assess the sensitivity of daily leaf photosynthesis (A(L)) to reductions in the A(sat), Theta and the initial slope (Phi) of the light-response curve at different stages of leaf development. On bright sunny days, and at all developmental stages, A(L) was ca. twice as sensitive to reductions in A(sat) than to reductions in Phi and Theta. In overcast conditions, however, all three parameters contributed significantly to reductions in leaf photosynthesis, although the contribution of Phi was greatest during early leaf growth, while older leaves were most sensitive to depressions in A(sat). The implications of these results for modelling the sensitivity of canopy photosynthesis to chill- induced photoinhibition of the light-response curve are discussed.
Download or read book Chilling and photosynthetic productivity of field grown maize Zea mays changes in the parameters of the light response curve canopy leaf CO2 assimilation rate and crop radiation use efficiency written by C M. Stirling and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of growth temperatures on the photosynthetic performance of field grown maize (Zea mays cv. LG11) was examined for crops sown on 1 May and 28 June 1991. During the period of growth, 2 May to 10 August, the early-sown crop experienced temperatures below 10 degrees C on 33 occasions compared with only one for the crop sown on 28 June. The prolonged period of low temperatures throughout May and beginning of June were associated with a marked depression in CO2 assimilation rates at all light levels in the early- sown treatment. Chili-induced depression of the photosynthetic light-response curve reflected a sustained reduction in canopy leaf photosynthesis and crop radiation-use efficiency (RUE). During the early stages of growth, RUE was 65% lower in the early- than late-sown treatment, with no marked recovery observed in the former treatment until approximately three weeks after chilling conditions had ceased. Data show a close correlation between chill-induced depression of quantum yield (Phi) and RUE, with corresponding reductions in the light- saturated rates of CO2 assimilation (P-max). The convexity of the light-response curve recovered most rapidly from chilling temperatures, and at least three weeks before any improvement in RUE. It is concluded that photosynthetic productivity of immature maize stands is less sensitive to changes in the convexity of the light response, than to changes in either Phi or P-max.
Download or read book Terrestrial Photosynthesis in a Changing Environment written by Jaume Flexas and published by Cambridge University Press. This book was released on 2012-07-19 with total page 753 pages. Available in PDF, EPUB and Kindle. Book excerpt: An integrated guide to photosynthesis in an environmentally dynamic context, covering all aspects from basic concepts to methodologies.
Download or read book Morphological Plant Modeling Unleashing Geometric and Topological Potential within the Plant Sciences written by Alexander Bucksch and published by Frontiers Media SA. This book was released on 2017-10-13 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: An increasing population faces the growing demand for agricultural products and accurate global climate models that account for individual plant morphologies to predict favorable human habitat. Both demands are rooted in an improved understanding of the mechanistic origins of plant development. Such understanding requires geometric and topological descriptors to characterize the phenotype of plants and its link to genotypes. However, the current plant phenotyping framework relies on simple length and diameter measurements, which fail to capture the exquisite architecture of plants. The Research Topic “Morphological Plant Modeling: Unleashing Geometric and Topological Potential within the Plant Sciences” is the result of a workshop held at National Institute for Mathematical and Biological Synthesis (NIMBioS) in Knoxville, Tennessee. From 2.-4. September 2015 over 40 scientists from mathematics, computer science, engineering, physics and biology came together to set new frontiers in combining plant phenotyping with recent results from shape theory at the interface of geometry and topology. In doing so, the Research Topic synthesizes the views from multiple disciplines to reveal the potential of new mathematical concepts to analyze and quantify the relationship between morphological plant features. As such, the Research Topic bundles examples of new mathematical techniques including persistent homology, graph-theory, and shape statistics to tackle questions in crop breeding, developmental biology, and vegetation modeling. The challenge to model plant morphology under field conditions is a central theme of the included papers to address the problems of climate change and food security, that require the integration of plant biology and mathematics from geometry and topology research applied to imaging and simulation techniques. The introductory white paper written by the workshop participants identifies future directions in research, education and policy making to integrate biological and mathematical approaches and to strengthen research at the interface of both disciplines.
Download or read book Crop Photosynthesis written by N.R. Baker and published by Elsevier. This book was released on 2013-10-22 with total page 471 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since photosynthetic performance is a fundamental determinant of yield in the vast majority of crops, an understanding of the factors limiting photosynthetic productivity has a crucial role to play in crop improvement programmes. Photosynthesis, unlike the majority of physiological processes in plants, has been the subject of extensive studies at the molecular level for many years. This reductionist approach has resulted in the development of an impressive and detailed understanding of the mechanisms of light capture, energy transduction and carbohydrate biosynthesis, processes that are clearly central to the success of the plant and the productivity of crops. This volume examines in the widest context the factors determining the photosynthetic performance of crops. The emphasis throughout the book is on the setting for photosynthesis rather than the fundamental process itself. The book will prove useful to a wide range of plant scientists, and will encourage a more rapid integration of disciplines in the quest to understand and improve the productivity of crops by the procedures of classical breeding and genetic manipulation.
Download or read book Crop Physiology Abstracts written by and published by . This book was released on 1996 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Second International Symposium on Sensors in Horticulture written by Bent S. Bennedsen and published by . This book was released on 1998 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Environmental Technologies written by Ji Zhao and published by Trans Tech Publications Ltd. This book was released on 2013-08-16 with total page 5540 pages. Available in PDF, EPUB and Kindle. Book excerpt: Selected, peer reviewed papers from the 2013 2nd International Conference on Energy and Environmental Protection (ICEEP 2013), April 19-21, 2013, Guilin, China
Download or read book Agronomie written by and published by . This book was released on 1999 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Australian Journal of Plant Physiology written by and published by . This book was released on 2001 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agrindex written by and published by . This book was released on 1995 with total page 964 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Variation of Photosynthesis Along a Leaf in Zea Mays L written by Amita Banerjee and published by . This book was released on 2014 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: Maize leaves are characterized by a complex architecture. The maize leaves are curved and this keeps changing with increasing leaf age. Due to the curvature of a maize leaf the amount of light intercepted may vary on different points on the surface of the leaf giving rise to a variation in photosynthesis on different positions along the same leaf. In this study semi-empirical models of photosynthetic light response curve have been used to understand the variation in photosynthesis along the 7th leaf of Zea mays P1625HR. The effect of increasing age on photosynthesis of a maize leaf was investigated and modelled. Non-linear regression was used to study the pattern of variation of photosynthesis with increasing leaf age.
Download or read book Report of the Institute of Terrestrial Ecology written by and published by . This book was released on 1994 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Photosynthesis Bibliography written by and published by . This book was released on 1994 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Crop Photosynthesis written by Neil R. Baker and published by . This book was released on 1992 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Photosynthesis in a Changing Global Climate a Matter of Scale written by Iker Aranjuelo and published by Frontiers Media SA. This book was released on 2021-02-25 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt:
