Non-Leaf-Level Algorithms in Structure Preserving HSS Matrix Inversion in Exact Arithmetic

Hydrophobic particle film technology (HPF) is a developing pest control system for tree fruit production systems. Studies were established in Chile, and Washington, Pennsylvania, and West Virginia in the United States, to evaluate the effect of HPF technology on tree fruit yield and quality. Studies in Chile, Washington, and West Virginia demonstrated increased photosynthetic rate at the leaf level. Yield was increased in peaches (Chile) and apples (West Virginia), and fruit size was increased in apples (Washington and Pennsylvania). Increased red color in apple was demonstrated at all sites with reduced russetting and `Stayman' cracking in Pennsylvania. HPF technology appears to be an effective tool in reducing water and heat stress in tree fruit resulting in increased fruit quality.

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Scaling leaf photosynthesis to canopy in a mixed deciduous forest. I. model description

Silva Gandavensis ◽

10.21825/sg.v62i0.842 ◽

1997 ◽

Vol 62 ◽

Author(s):

R. Samson ◽

S. Follens ◽

R. Lemeur

Keyword(s):

Temperature Dependence ◽

Quercus Robur ◽

Deciduous Forest ◽

Growing Season ◽

Model Description ◽

Canopy Photosynthesis ◽

Leaf Photosynthesis ◽

Layer Model ◽

Mixed Deciduous Forest ◽

Leaf Level

A multi-layer model (FORUG) was developed, to simulate the canopy photosynthesis of a mixed deciduous forest during the growing season. Measured photosynthesis parameters, for beech (Fagus sylvatica), oak (Quercus robur) and ash (Fraxinus excelsior), were used as input to the model. This information at the leaf level is then scaled up to the level of the canopy, taking into account the radiation profiles (diffuse and direct PAR) in the canopy, the vertical LAI distribution, the evolution of the LAI and the photosynthesis parameters during the growing season, and the temperature dependence of the latter parameters.

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Shape awareness and structure-preserving network for arbitrary shape text detection

Multimedia Tools and Applications ◽

10.1007/s11042-020-10039-9 ◽

2021 ◽

Author(s):

Qi Cheng ◽

Guodong Wang

Keyword(s):

Arbitrary Shape ◽

Text Detection ◽

Structure Preserving

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The contribution of PIP2-type aquaporins to photosynthetic response to increased vapour pressure deficit

Journal of Experimental Botany ◽

10.1093/jxb/erab187 ◽

2021 ◽

Author(s):

D Israel ◽

S Khan ◽

C R Warren ◽

J J Zwiazek ◽

T M Robson

Keyword(s):

Vapour Pressure Deficit ◽

Air Humidity ◽

Wild Type ◽

Knockout Mutant ◽

Evaporative Demand ◽

Co2 Transport ◽

Whole Plant ◽

Knockout Mutants ◽

Leaf Level ◽

Low Humidity

Abstract The roles of different plasma membrane aquaporins (PIPs) in leaf-level gas exchange of Arabidopsis thaliana were examined using knockout mutants. Since multiple Arabidopsis PIPs are implicated in CO2 transport across cell membranes, we focused on identifying the effects of the knockout mutations on photosynthesis, and whether they are mediated through the control of stomatal conductance of water vapour (gs), mesophyll conductance of CO2 (gm) or both. We grew Arabidopsis plants in low and high humidity environments and found that the contribution of PIPs to gs was larger under low air humidity when the evaporative demand was high, whereas any effect of lacking PIP function was minimal under higher humidity. The pip2;4 knockout mutant had 44% higher gs than the wild type plants under low humidity, which in turn resulted in an increased net photosynthetic rate (Anet). We also observed a 23% increase in whole-plant transpiration (E) for this knockout mutant. The lack of functional AtPIP2;5 did not affect gs or E, but resulted in homeostasis of gm despite changes of humidity, indicating a possible role in regulating CO2 membrane permeability. CO2 transport measurements in yeast expressing AtPIP2;5 confirmed that this aquaporin is indeed permeable to CO2.

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