Below-ground carbon distribution in barley (Hordeum vulgare L.) with and without nitrogen fertilization

1992 ◽  
Vol 144 (1) ◽  
pp. 93-99 ◽  
Author(s):  
Gerd Johansson
Keyword(s):  
Hordeum Vulgare ◽  
Nitrogen Fertilization ◽  
Carbon Distribution ◽  
Hordeum Vulgare L ◽  
Below Ground

Root exudation and rhizoplane bacterial abundance of barley (Hordeum vulgare L.) in relation to nitrogen fertilization and root growth

1990 ◽  
Vol 127 (1) ◽  
pp. 81-89 ◽  
Author(s):  
E. Liljeroth ◽  
E. Bååth ◽  
I. Mathiasson ◽  
T. Lundborg
Keyword(s):  
Hordeum Vulgare ◽  
Root Growth ◽  
Nitrogen Fertilization ◽  
Bacterial Abundance ◽  
Root Exudation ◽  
Hordeum Vulgare L

Above- and below-ground net primary production of four barley (Hordeum vulgare L.) cultivars in western Canada

1992 ◽  
Vol 72 (4) ◽  
pp. 1131-1140 ◽  
Author(s):  
J. G. Xu ◽  
N. G. Juma
Keyword(s):  
Organic Matter ◽  
Hordeum Vulgare ◽  
Primary Production ◽  
Net Primary Production ◽  
Root Mass ◽  
Hordeum Vulgare L ◽  
Ripening Stages ◽  
Wide Range ◽  
Below Ground ◽  
Shoot Mass

Information on above- and below-ground primary production for a wide range of agro-ecosystems is needed. The objective of this study was to quantify the shoot and root mass, shoot mass/root mass ratios, and root lengths of four barley (Hordeum vulgare L.) cultivars (Abee, Bonanza, Harrington and Samson) grown in a Black Chernozem in north-central Alberta. The cultivars were grown using a randomized complete block design with three replicates and were sampled at the tillering, stem-extension, heading, and ripening stages. Root mass and root lengths from soil cores were measured. The results showed that (1) shoot mass and root mass of Harrington and Bonanza were not different from those of Abee and Samson, but those of Abee were significantly greater than those of Samson, indicating that the below-ground input of organic matter could be a function of specific cultivar; (2) root mass increased rapidly until the heading stage, and shoot mass increased at a higher rate than roots between the heading and ripening stages, producing a widening of shoot/root ratios with time; and (3) decomposition of very small roots may have contributed to a more rapid decrease in root length than in root mass after the heading stage.Key words: Barley (Hordeum vulgare L.) cultivars, Typic Cryoboroll, root mass, root lengths, shoot/root ratio, soil organic matter

Ultrastructure and Senescence in an Achloroplastic Mutant of Hordeum vulgare L. cv. Dyan

1992 ◽  
Vol 50 (1) ◽  
pp. 844-845
Author(s):  
R.H.M. Cross ◽  
C.E.J. Botha ◽  
A.K. Cowan ◽  
B.J. Hartley
Keyword(s):  
Cell Wall ◽  
Hordeum Vulgare ◽  
Leaf Tissue ◽  
Ultrastructural Changes ◽  
Hordeum Vulgare L ◽  
Mesophyll Cells ◽  
Lethal Mutant ◽  
Cytoplasmic Matrix ◽  
Close Proximity ◽  
Pinocytotic Vesicles

Senescence is an ordered degenerative process leading to death of individual cells, organs and organisms. The detection of a conditional lethal mutant (achloroplastic) of Hordeum vulgare has enabled us to investigate ultrastructural changes occurring in leaf tissue during foliar senescence.Examination of the tonoplast structure in six and 14 day-old mutant tissue revealed a progressive degeneration and disappearance of the membrane, apparently starting by day six in the vicinity of the mitochondria associated with the degenerating proplastid (Fig. 1.) where neither of the plastid membrane leaflets is evident (arrows, Fig. 1.). At this stage there was evidence that the mitochondrial membranes were undergoing retrogressive changes, coupled with disorganization of cristae (Fig. 2.). Proplastids (P) lack definitive prolamellar bodies. The cytoplasmic matrix is largely agranular, with few endoplasmic reticulum (ER) cisternae or polyribosomal aggregates. Interestingly, large numbers of actively-budding dictysomes, associated with pinocytotic vesicles, were observed in close proximity to the plasmalemma of mesophyll cells (Fig. 3.). By day 14 however, mesophyll cells showed almost complete breakdown of subcellular organelle structure (Fig. 4.), and further evidence for the breakdown of the tonoplast. The final stage of senescence is characterized by the solubilization of the cell wall due to expression and activity of polygalacturonase and/or cellulose. The presence of dictyosomes with associated pinocytotic vesicles formed from the mature face, in close proximity to both the plasmalemma and the cell wall, would appear to support the model proposed by Christopherson for the secretion of cellulase. This pathway of synthesis is typical for secretory glycoproteins.

ИЗМЕНЧИВОСТЬ ЯЧМЕНЯ (Hordeum vulgare L.) РАЗНОГО ГЕОГРАФИЧЕСКОГО ПРОИСХОЖДЕНИЯ ПО ЭЛЕМЕНТАМ СТРУКТУРЫ УРОЖАЯ

2012 ◽  
pp. 33-40
Author(s):  
А.В. ЖЕЛЕЗНОВ ◽  
◽  
Н.Б. ЖЕЛЕЗНОВА ◽  
Т.В. КУКОЕВА ◽  
Н.В. БУРМАКИНА ◽  
...  
Keyword(s):  
Hordeum Vulgare ◽  
Hordeum Vulgare L

ВНУТРИВИДОВОЙ ПОЛИМОРФИЗМ ЯРОВОГО ЯЧМЕНЯ (Hordeum vulgare L.) ПО УСТОЙЧИВОСТИ К ДЕЙСТВИЮ СВИНЦА

2014 ◽  
pp. 78-87 ◽  
Author(s):  
А.В. ДИКАРЕВ ◽  
◽  
В.Г. ДИКАРЕВ ◽  
Н.С. ДИКАРЕВА ◽  
С.А. ГЕРАСЬКИН ◽  
...  
Keyword(s):  
Hordeum Vulgare ◽  
Hordeum Vulgare L
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