Structure of the Primary Shoot of Ephedra viridis Cov.

1993 ◽  
Vol 154 (2) ◽  
pp. 264-279 ◽  
Author(s):  
Ruth A. Cresson ◽  
Ray F. Evert
Keyword(s):  
Primary Shoot

Early Pinus caribaea var. hondurensis root development. 2. Influence of soil strength

1996 ◽  
Vol 36 (7) ◽  
pp. 847 ◽  
Author(s):  
A Costantini ◽  
D Doley ◽  
HB So
Keyword(s):  
Root Development ◽  
Soil Type ◽  
Root Elongation ◽  
Primary Root ◽  
High Strength ◽  
Soil Strength ◽  
Shoot Development ◽  
Pinus Caribaea ◽  
Primary Shoot ◽  
Primary Roots

The influence of penetration resistance (PR), an easily measured indicator of soil strength, on the growth of Pinus caribaea var. hondurensis radicles and seedlings was investigated. Negative exponential relationships between PR and both radicle and primary root elongation were observed. All root elongation ceased at PR levels of 3.25 MPa. Tip diameters of radicles and primary roots were positively correlated with PR values up to 2.4 MPa, whilst numbers of primary roots, total root lengths and lengths of longest roots were all negatively correlated with PR. Hypocotyl elongation was also reduced by increasing PR, although the reductions occurred at higher PRs than those which inhibited root development. In contrast, primary shoot development was unaffected by PR levels which were sufficient to stop root elongation, but was reduced in soil with a PR of 4.8 MPa. There were significant family x soil type and family x PR interactions for radicle, hypocotyl, primary root and primary shoot development. 1f these interactions are correlated with performance in the field, then they may serve as useful indicators of family suitability to both soil type and high strength soils.

Responses of Some Turkish Wheat Cultivars to Vernalization and Photoperiod

1988 ◽  
Vol 24 (2) ◽  
pp. 237-245
Author(s):  
Serpil Terzioğlu
Keyword(s):  
Bread Wheat ◽  
Normal Development ◽  
Photoperiodic Response ◽  
Reliable Information ◽  
Floral Initiation ◽  
Wheat Cultivars ◽  
Primary Shoot ◽  
Time Of Year ◽  
Short Days

SUMMARYThe vernalization and photoperiodic response of six locally adapted bread wheat cultivars grown under natural daylength conditions during the summer or winter months was examined in glasshouse experiments. The wheat was vernalized by chilling imbibed grains at 2 ± 1°C for 0, 15 or 45 days. Vernalization for 45 days followed by long summer days led to floral initiation in all cultivars within 28 days but vernalization for 0 or 15 days only led to floral initiation in one cultivar. Vernalization followed by long days reduced the time from transplanting to anthesis, resulting in early ear emergence. Vernalization followed by short days accelerated the development of all the cultivars, but normal development could also occur without vernalization at this time of year. Apical differentiation of the primary shoot and its length and development gave the most reliable information on the period of vernalization required.

An altered body plan is conferred on Arabidopsis plants carrying dominant alleles of two genes

Development ◽  
1996 ◽  
Vol 122 (8) ◽  
pp. 2395-2403 ◽  
Author(s):  
B. Grbic ◽  
A.B. Bleecker
Keyword(s):  
Shoot Apical Meristem ◽  
Apical Meristem ◽  
Reproductive Development ◽  
Body Plan ◽  
Chromosome 4 ◽  
Chromosome 5 ◽  
Present Evidence ◽  
Primary Shoot ◽  
Axillary Meristems

In this paper, we describe a late-flowering ecotype of Arabidopsis, Sy-0, in which the axillary meristems maintain a prolonged vegetative phase, even though the primary shoot apical meristem has already converted to reproductive development. This novel heterochronic shift in the development of axillary meristems results in the formation of aerial rosettes of leaves at the nodes of the primary shoot axis. We present evidence that the aerial-rosette phenotype arises due to the interaction between dominant alleles of two genes: ART, aerial rosette gene (on chromosome 5) and EAR, enhancer of aerial rosette (on chromosome 4): EAR has been tentatively identified as a new allele of the FRI locus. The possible role of these two genes in the conversion of shoot apical meristems to reproductive development is discussed.

The Primary Shoot: Leaf Development

1993 ◽  
pp. 283-313
Author(s):  
John A. Romberger ◽  
Zygmunt Hejnowicz ◽  
Jane F. Hill
Keyword(s):  
Leaf Development ◽  
Primary Shoot

The Primary Shoot: Apex and Caulis

1993 ◽  
pp. 225-262
Author(s):  
John A. Romberger ◽  
Zygmunt Hejnowicz ◽  
Jane F. Hill
Keyword(s):  
Shoot Apex ◽  
Primary Shoot

Herbage yields of pigeonpea (Cajanus cajan) accessions in a humid tropical environment as affected by pruning management

1995 ◽  
Vol 125 (2) ◽  
pp. 227-232 ◽  
Author(s):  
J. Cobbina
Keyword(s):  
Leucaena Leucocephala ◽  
Cajanus Cajan ◽  
Dry Matter ◽  
Dry Season ◽  
Local Variety ◽  
Primary Shoot ◽  
Herbage Yield ◽  
Biomass Yields ◽  
To Receive ◽  
Effect Of Age

SUMMARYTwelve accessions of pigeonpea (Cajanus cajan [L.] Millsp.) were grown on an Alfisol in a humid ecozone in Nigeria in 1989. At 4 and 8 months after planting (MAP), the primary growth was cut to determine the effect of age at first pruning on stump survival and coppice regrowth, and also on total herbage yield in a 12-month pruning cycle. It was clear that a height of 3 m or more is adequate for pigeonpea to receive its first cut with only 10% stool mortalities. Cutting the primary shoot at 8 MAP (in the dry season) ensured greater stump survival and also stimulated rapid coppice shoot regrowth, indicating the advantage of coppicing in the dry season and also at maturity. The total leaf and wood dry matter (DM) production in a 12-month cycle is greatest if the primary shoot was first cut at 8 MAP. This suggests that allowing the trees to become established is beneficial in the pruning management of pigeonpea. Accessions 11563 and 11575 have the ability to produce 7 t/ha of leaf DM from two prunings when first cut at 8 MAP, and significantly outperformed the local variety. The study revealed that pigeonpea does not coppice well and its biomass yields are much lower than that of Leucaena leucocephala.

scholarly journals Vegetative Response of Vitis vinifera to Prohexadione-calcium

HortScience ◽  
2003 ◽  
Vol 38 (7) ◽  
pp. 1435-1438 ◽  
Author(s):  
Danielle Lo Giudice ◽  
Tony K. Wolf ◽  
Richard P. Marini
Keyword(s):  
Vitis Vinifera ◽  
Crop Yield ◽  
Vegetative Growth ◽  
Shoot Growth ◽  
Field Experiments ◽  
Field Conditions ◽  
Cabernet Sauvignon ◽  
Cabernet Franc ◽  
Primary Shoot ◽  
Prohexadione Calcium

Prohexadione-calcium (prohexadione-Ca) was evaluated for its ability to suppress vegetative growth of grapevines (Vitis vinifera L.) under field conditions. Two or three applications of 250 mg·L-1 prohexadione-Ca reduced primary shoot growth of `Cabernet Sauvignon', but had little effect on other canopy characteristics or cane pruning weights. The reduction of shoot growth was not persistent and shoot hedging was ultimately needed to avoid canopy shading. Similarly, three applications of either 125, 250, or 375 mg·L-1 prohexadione-Ca reduced `Cabernet franc' shoot growth, but again did not eliminate the need for shoot hedging. Cane pruning weights of `Cabernet franc' were unaffected by treatment, and canopy characteristics were generally not improved. Two prebloom and one postbloom application of 250 mg·L-1 prohexadione-Ca were evaluated on `Cabernet franc' and `Chardonnay' in separate field experiments. The prebloom treatments retarded shoot growth of `Chardonnay', but had no effects on `Cabernet franc' shoot characteristics. To retard shoot growth, prohexadione-Ca had to be applied prior to bloom; however, prebloom applications had the potential for severe reductions in crop yield.

Physical Constraint and Tiller Growth in Wheat

1975 ◽  
Vol 23 (2) ◽  
pp. 213 ◽  
Author(s):  
RF Williams ◽  
RA Metcalf
Keyword(s):  
Leaf Sheath ◽  
Wheat Seedlings ◽  
Physical Constraint ◽  
Vertical Slit ◽  
Natural Constraint ◽  
Primary Shoot

Young wheat seedlings were subjected to mild physical constraint by placing short plastic collars with internal diameters of 1.5, 1.7 and 2.0 mm around the coleoptile close to the grain. In others the natural constraint of the coleoptile was reduced experimentally by making a vertical slit just above the site of the coleoptile tiller. The narrowest of the plastic collars reduced the growth of the primary shoot, but the others did not. Collars of all sizes prevented the emergence of all tillers sited immediately within them, though the coleoptile tiller, and occasionally the first tiller 'escaped' through the coleoptile or leaf sheath tissues below the collar. The coleoptile tillers of about half of the surgically treated seedlings grew vigorously, but those of the control plants did not. The results are interpreted as supporting the hypothesis that physical constraint can be an impor- tant determinant of developmental events within shoot apical systems.

Sign in / Sign up

Export Citation Format

Share Document