scholarly journals Shoot proliferation and organogenesis on Arbutus unedo: physiological analysis under water stress

2019 ◽  
Vol 63 (1) ◽  
pp. 278-286 ◽  
Author(s):  
J.F. Martins ◽  
S. Correia ◽  
B. Correia ◽  
G. Pinto ◽  
J.M. Canhoto
Keyword(s):  
Water Stress ◽  
Shoot Proliferation ◽  
Arbutus Unedo ◽  
Physiological Analysis

Role of xanthophyll cycle-mediated photoprotection in Arbutus unedo plants exposed to water stress during the Mediterranean summer

2008 ◽  
Vol 46 (3) ◽  
pp. 378-386 ◽  
Author(s):  
R. Baraldi ◽  
F. Canaccini ◽  
S. Cortes ◽  
F. Magnani ◽  
F. Rapparini ◽  
...  
Keyword(s):  
Water Stress ◽  
Xanthophyll Cycle ◽  
Arbutus Unedo ◽  
The Mediterranean

scholarly journals Physiological analysis of papaya seedlings 'Rubi Incaper 511' under different irrigation depths

2020 ◽  
pp. 622-626
Author(s):  
Vinicius de Souza Oliveira ◽  
Stefany Sampaio Silveira ◽  
Robson Prucoli Posse ◽  
Ana Paula Braido Pinheiro ◽  
Karina Tiemi Hassuda ◽  
...  
Keyword(s):  
Water Stress ◽  
Experimental Design ◽  
Nitrogen Balance ◽  
Physiological Changes ◽  
Total Chlorophyll ◽  
Seedling Production ◽  
Plant Leaves ◽  
Total Chlorophyll Content ◽  
Physiological Analysis ◽  
Irrigation Depth

One of the main limitations in the process of seedling production is the proper management of irrigation, since this practice implies the costs of orchard implantation. The application of the wrong amount of water leads to water stress in plants causing physiological changes, impairing its development and quality. Thus, the objective of this study was to evaluate the influence of different irrigation slides on the physiological behavior of 'Rubi INCAPER 511' papaya seedlings. The study was conducted during the period from September 9 to November 7, 2016. The experimental design was completely randomized, where the treatments consisted of four different irrigation depth: 8, 10, 12 and 14 mm d-1. Each treatment was composed of 24 plants (repetitions), totaling 96 plants in the experiment. 60 days after planting, plant leaves were evaluated using the following physiological characteristics: total chlorophyll content (SFR-G and SFR_R); flavonoid index (FLAV); anthocyanin index (ANT_RG and ANT_RB) and nitrogen balance (NBI_G and NBI_R). Irrigation depth between 10.96 and 11.03 mmd-1 provided better values for the analyzed characteristics. Therefore, the 11 mmd-1 depth is the most suitable for the production of seedlings, based on the physiological evaluations.

scholarly journals OSMOTIC ADJUSTMENT AND GROWTH RESPONSE OF THREE in vitro GROWN Chrysanthemum morifolium Ramat. CULTIVARS TO OSMOTIC STRESS.

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1125a-1125
Author(s):  
Rida Shibli ◽  
L. Art Spomer ◽  
Mary Ann Lila Smith
Keyword(s):  
Water Stress ◽  
Osmotic Adjustment ◽  
Growth Response ◽  
Shoot Proliferation ◽  
Chrysanthemum Morifolium ◽  
Root Number ◽  
Weighted Density ◽  
Chrysanthemum Morifolium Ramat ◽  
Osmotic Properties

Osmotic adjustment in response to decreasing media water availability was observed for in vitro Chrysanthemum morifolium Ramat. cultivars Bright Golden Anne, Deep Luv, and Lucido. Water stress was induced by increasing sorbitol (0, 0.1, 0.2, 0.3, 0.4 M), mannitol (0, 0.1, 0.2, 0.3, 0.4 M), and sucrose (30, 45, 60, 75, 90 g·l-1) concentrations in modified MS media (2 mg·l-1 BA and 0.1 mg·l-1 NAA). Osmotic adjustment was evidenced by a significant reduction in measured cell sap osmotic potential (R2 = 0.78, 0.96, 0.91 for sucrose, sorbitol, and mannitol respectively) in all cultivars. Shoot length, weighted density (apparent mass), and proliferation were significantly reduced by sorbitol and mannitol treatments. Sucrose reduced shoot proliferation, increased length, and had an inconsistent effect on weighted density. Cultures grown on media without hormones showed tremendous increase in root number up to 60 g·l-1 sucrose. Sorbitol had a negligible effect on rooting at 0.1 M but no roots developed at higher sorbitol concentrations or in any mannitol treatments. Plants transferred to a non-water-stress media after they had experienced in vitro water stress exhibited no change in osmotic properties from the stress treatments.

An investigation of the grain yield adaptation of advanced CIMMYT wheat lines to water stress environments in Queensland. I. Crop physiological analysis

1994 ◽  
Vol 45 (5) ◽  
pp. 965 ◽  
Author(s):  
M Cooper ◽  
DE Byth ◽  
DR Woodruff
Keyword(s):  
Water Stress ◽  
Grain Yield ◽  
Dry Matter ◽  
Unit Area ◽  
Strong Association ◽  
Yield Component ◽  
Grain Number ◽  
Yield Improvement ◽  
Wheat Improvement ◽  
Physiological Analysis

Wheat improvement in Australia has made extensive use of germplasm developed by the International Maize and Wheat Improvement Center (CIMMYT). The opportunity for further yield improvement in Queensland was investigated by comparing CIMMYT lines and Queensland cultivars in irrigated and dryland environments at three locations. CIMMYT lines were identified, with greater than 20% yield advantage in individual environments and between 15 and 20% yield advantage over the six environments. The line mean repeatability for yield was moderate (0.492), with the variance component for line by environment (L x E) interaction 4.2 times that for lines. Therefore, while the CIMMYT lines expressed considerable L x E interaction, there was scope for further yield improvement. The water stress differential between the irrigated and dryland environments at the three locations strongly influenced L x E interaction for grain yield. Pre-anthesis water stress generated more L x E interaction for grain yield than post-anthesis stress. At the two locations where pre-anthesis water stress was severe in the dryland environment, there was no association (P > 0.05) between yield under irrigated and dryland conditions. However, at the location where there was little pre-anthesis stress and a degree of post-anthesis stress there was a strong association (P < 0.01) between yield under irrigated and dryland conditions. Grain yield was positively associated with the yield component grain number per unit area in all environments. Grain weight showed little L x E interaction across environments and the majority of L x E interaction for grain yield resulted from L x E interaction associated with grain number per unit area. Grain number per unit area was positively associated with the component grains per fertile tiller but not tiller number per unit area. Grains per fertile tiller was in turn positively associated with total dry matter at anthesis; however, there was no direct association between total dry matter at anthesis and grain number per unit area. There was a weak association between days to anthesis and grain yield in four of the six environments.

Biscogniauxia (Hypoxylon) Canker or Dieback in Trees

EDIS ◽  
2017 ◽  
Vol 2017 (6) ◽  
Author(s):  
Claudia Paez ◽  
Jason A. Smith
Keyword(s):  
Water Stress ◽  
Tree Species ◽  
Soil Compaction ◽  
Urban Areas ◽  
Root Disease ◽  
Poor Health ◽  
Green Spaces ◽  
Opportunistic Pathogens ◽  
Wide Range ◽  
Quercus Spp

Biscogniauxia canker or dieback (formerly called Hypoxylon canker or dieback) is a common contributor to poor health and decay in a wide range of tree species (Balbalian & Henn 2014). This disease is caused by several species of fungi in the genus Biscogniauxia (formerly Hypoxylon). B. atropunctata or B. mediterranea are usually the species found on Quercus spp. and other hosts in Florida, affecting trees growing in many different habitats, such as forests, parks, green spaces and urban areas (McBride & Appel, 2009).  Typically, species of Biscogniauxia are opportunistic pathogens that do not affect healthy and vigorous trees; some species are more virulent than others. However, once they infect trees under stress (water stress, root disease, soil compaction, construction damage etc.) they can quickly colonize the host. Once a tree is infected and fruiting structures of the fungus are evident, the tree is not likely to survive especially if the infection is in the tree's trunk (Anderson et al., 1995).

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