Ecotypic variation in root respiration rate among elevational populations ofAbies lasiocarpa andPicea engelmannii

Oecologia ◽  
1986 ◽  
Vol 68 (3) ◽  
pp. 375-379 ◽  
Author(s):  
J. B. Sowell ◽  
G. G. Spomer
Keyword(s):  
Respiration Rate ◽  
Root Respiration ◽  
Ecotypic Variation

scholarly journals Changes in Respiration Rate and Energy of Activation after Chilling and Forcing Dormant Apple Trees

1990 ◽  
Vol 115 (5) ◽  
pp. 809-814 ◽  
Author(s):  
Eric Young
Keyword(s):  
Root Growth ◽  
Respiration Rate ◽  
Root Respiration ◽  
Energy Of Activation ◽  
Apple Trees

Dormant apple trees (Malus domestics Borkh., cv. MM. 111) were chilled at SC for O, 500, 1000, or 1500 hours and then forced at 10, 20, or 30C for 21 days. Budbreak and root growth were recorded after forcing, and shoot and root respiration was measured at 5, 10, 20, and 30C to determine Q10 and energy of activation values. Budbreak, root growth, and respiration generally increased with chilling and forcing temperature. The Q10 of shoot respiration increased significantly with increasing chilling when measured before forcing; however, after forcing, Q10 decreased with chilling. Root respiration Q10 was not as influenced as shoot respiration by chilling either before or after forcing. Energy of activation for shoot and root respiration decreased significantly with chilling after forcing at each temperature.

scholarly journals Effects of Different Fumigants on the Replanted Soil Environment and Growth of Malus hupehensis Rehd. Seedlings

HortScience ◽  
2021 ◽  
pp. 1-9
Author(s):  
Ran Chen ◽  
Weitao Jiang ◽  
Haiyan Wang ◽  
Fengbing Pan ◽  
Hai Fan ◽  
...  
Keyword(s):  
Respiration Rate ◽  
Methyl Bromide ◽  
Root Respiration ◽  
Abiotic Factors ◽  
Pathogenic Fungi ◽  
Soil Environment ◽  
Apple Replant Disease ◽  
Calcium Cyanamide ◽  
Malus Hupehensis ◽  
Metham Sodium

Apple replant disease (ARD) has been reported in all major fruit-growing regions of the world and is often caused by biotic factors (pathogen fungi) and abiotic factors (phenolic compounds). Soil chemical fumigation can kill soil pathogenic fungi; however, the traditionally used fumigant methyl bromide has been banned because of its ozone-depleting effects. There is thus a need to identify greener fumigant candidates. We characterized the effects of different fumigants on the replanted soil environment and the growth characteristics of Malus hupehensis Rehd. seedlings. All five experimental treatments [treatment 1 (T1), metham-sodium; treatment 2 (T2), dazomet; treatment 3 (T3), calcium cyanamide; treatment 4 (T4), 1,3-dichloropropene; and treatment 5 (T5), methyl bromide] promoted significantly the biomass, root growth, and root respiration rate of M. hupehensis seedlings and the ammonium nitrogen (NH4+-N) and nitrate nitrogen (NO3–-N) contents of replanted soil. Metham sodium (T1) and dazomet (T2) had stronger effects compared with 1,3-dichloropropene (T4) and calcium cyanamide (T3). At 172 days after T1, the height, root length, and root respiration rate of Malus hupehensis Rehd. seedlings, and the NH4+-N and NO3–-N contents of replanted soil increased by 91.64%, 97.67%, 69.78%, 81.98%, and 27.44%, respectively, compared with the control. Thus, dazomet and metham sodium were determined to be the optimal fumigants for use in practical applications.

Root respiration rate before and just after clear-felling in a mature, deciduous, broad-leaved forest

1996 ◽  
Vol 11 (2) ◽  
pp. 111-119 ◽  
Author(s):  
Kaneyuki Nakane ◽  
Takahiro Kohno ◽  
Takao Horikoshi
Keyword(s):  
Respiration Rate ◽  
Root Respiration ◽  
Broad Leaved Forest ◽  
Leaved Forest

Effect of soil salinity on the wheat and bean root respiration rate at low matric suctions

2017 ◽  
Vol 15 (3) ◽  
pp. 639-648 ◽  
Author(s):  
Mohammad Hossein Mohammadi ◽  
Mahnaz Khataar ◽  
Farid Shekari
Keyword(s):  
Respiration Rate ◽  
Soil Salinity ◽  
Root Respiration ◽  
Bean Root

Root respiration has limited value for assessing Douglas-fir seedling quality

1987 ◽  
Vol 17 (9) ◽  
pp. 1144-1147 ◽  
Author(s):  
Douglas D. McCreary ◽  
Joe B. Zaerr
Keyword(s):  
Respiration Rate ◽  
Root Respiration ◽  
Rapid Heating ◽  
Douglas Fir ◽  
Seedling Quality ◽  
Root Damage ◽  
Quality Test ◽  
Response Period ◽  
Growth Room ◽  
Survival And Growth

Root damage is a principal cause of poor seedling quality. Currently, the most widely used seedling-quality test measures a seedling's ability to initiate and elongate roots in a favorable environment; however, this test requires a lengthy response period and tedious, time-consuming measurements. Alternatively, the respiration rate of roots could be measured much more quickly and easily. Results of this study, which examined whether root respiration could successfully predict the survival and growth of potted Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings in a growth room, indicated that respiration may help assess root damage caused by desiccation but not that caused by freezing, hot storage, or rapid heating.

scholarly journals Relationships between root respiration rate and root morphology, chemistry and anatomy in Larix gmelinii and Fraxinus mandshurica

2013 ◽  
Vol 33 (6) ◽  
pp. 579-589 ◽  
Author(s):  
S. Jia ◽  
N. B. McLaughlin ◽  
J. Gu ◽  
X. Li ◽  
Z. Wang
Keyword(s):  
Respiration Rate ◽  
Root Morphology ◽  
Root Respiration ◽  
Larix Gmelinii ◽  
Fraxinus Mandshurica

Basal and maintenance respiration of mycorrhizal and nonmycorrhizal root systems of conifers

1987 ◽  
Vol 17 (8) ◽  
pp. 872-877 ◽  
Author(s):  
John D. Marshall ◽  
David A. Perry
Keyword(s):  
Root System ◽  
Respiration Rate ◽  
Ponderosa Pine ◽  
Root Respiration ◽  
Root Systems ◽  
The Other ◽  
Silica Sand ◽  
Maintenance Respiration ◽  
Root Longevity ◽  
Respiration Rates

We measured CO2 efflux from root systems of mycorrhizal and nonmycorrhizal conifer seedlings planted in silica sand and maintained in darkness for 11 to 15 days. We first compared methods of isolating the root system for root respiration measurement using Douglas-fir seedlings (Pseudotsugamenziesii (Mirb.) Franco). Shoot excision effectively isolated the root system and affected total root respiration only slightly. We used this technique to compare respiration rates of mycorrhizal and nonmycorrhizal root systems of ponderosa pine (Pinusponderosa Laws.) seedlings. Some seedlings were uninoculated; others were infected with an ectomycorrhizal species (Laccahalaccata or Hebelomacrustuliniforme) or an unidentified ectendomycorrhizal species. After shoot excision, respiration rates declined within 48 h to a "maintenance" respiration rate. Over the next several days, the respiration rate continued to decline to a much lower "basal" rate typical of nonphotosynthetic seedlings depleting their reserves. The maintenance respiration rate of the Laccaria-infected seedlings was significantly lower than those of the other treatments. The basal respiration rates of the two ectomycorrhizal treatments (Laccaria and Hebeloma) were lower than those of the other groups. Such reductions in respiration rate might strongly affect root longevity and whole-plant carbon budgets.

scholarly journals The Effect of Photoperiod Duration Upon the Respiratory Activity of the Roots of Wheat Seedlings

1966 ◽  
Vol 19 (3) ◽  
pp. 471 ◽  
Author(s):  
TF Neales ◽  
JA Davies
Keyword(s):  
Circadian Rhythm ◽  
Respiration Rate ◽  
High Intensity ◽  
Root Respiration ◽  
Respiratory Activity ◽  
Controlled Environment ◽  
Wheat Seedlings ◽  
Co2 Output ◽  
Two Peaks ◽  
High Intensity Light

The root respiration rate of wheat seedlings was continuously measured (in terms of CO2 output) in a controlled environment. The effects of varying photoperiods of high intensity light, incident on the leaves, upon the rate of root respiration were studied. It was demonstrated that increases in root respiration rate occurred in response to the light treatments. The fluctuations in root respiration rate, induced by the photoperiods used, had a pattern over the 24-hr cycle, which included two peaks-when the photoperiod was of 6 or 12 hr duration. These henomena are discussed in relation to the hypothesis that root respiration rate fluctuates in response to a varying flow of assimilates from the leaves to the roots. No evidence was obtained of an endogenous (or circadian) rhythm of root respiration rate.

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