Leaf Growth and Development in the Young Tobacco Plant

Hannam, Rae V

doi:10.1071/bi9680855

Cited by 21 publications

(4 citation statements)

References 15 publications

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“…This may be interpreted to mean that the establishment of a more efficient supply of substrate partially releases the limitations on the growth of the primordium (Williams 1960;Patrick 1972b). Similar observations have been made in tobacco, whereby the halt in the decline in the relative growth rate of an expanding leaf is associated with the appearance of sieve tubes in the lamina (Hannam 1968). However, whether or not these are causal correlations requires further investigation.…”

Section: Discussionsupporting

confidence: 57%

Distribution of Assimilate During Stem Elongation in Wheat

Patrick¹

1972

Aust. Jnl. Of Bio. Sci.

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During the phase of stem extension in plants of Triticum aestivum L. cv. Stewart, the distribution of assimilated 14C appeared to be related to sink size, proximity to the source, and a canalizing effect imposed by the vascular system on the movement between leaves. Evidence was found of a greater resistance to export from a leaf in the upward than in the downward direction and this is consistent with the observed arrangement of the sieve elements linking the bundles at the nodes. The cross· sectional area of the phloem did not appear to impose a limitation on the amount of material transported to the apex. The bulk of carbon imported by a growing leaf was consistently transported from the second lamina below. Import from other leaves continued after the emergence of a lamina and accounted for some 80% of its final dry weight and 50% of that in the attached sheath. The elongating internodes 81ther side of the leaf formed large sinks for its photosynthate. Ear growth, prior to its emergence, was supported by the upper three leaves. After emergence the flag leaf was the main supplier.

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Section: Discussionsupporting

confidence: 57%

Distribution of Assimilate During Stem Elongation in Wheat

Patrick¹

1972

Aust. Jnl. Of Bio. Sci.

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“…The two-phase leaf expansion described here for L. sativa following emergence (Figs 1,2) was similar to the biphasic growth of Nicotiana tabacum (Hannam, 1968 ;Clough & Milthorpe, 1975). If a just-initiated L. sativa leaf is 300 µg f. wt (a cubic mass of cells c. 6.7 µm a side) and if the early phase of expansion was constant from initiation, then leaf initiation would occur at k8 LPI.…”

Section: Developmental Implicationssupporting

confidence: 63%

Effects of salinization on nutrient transport to lettuce leaves: consideration of leaf developmental stage

Lazof

Bernstein

1999

New Phytologist

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Most recent reviews of plant salinity response have included the concept of a nutritional disturbance as one likely mechanism by which shoot growth might be inhibited. None the less, few studies of dicotyledonous plants have presented data on nutrient transport into the most intensively growing shoot tissues. In this paper net nutrient deposition was followed for 3 d in 8 sequential, growing leaves of Lactuca sativa, which were grown either in conditions of moderate salinization, or in a growth-stimulating concentration of NaCl. The nutrient deposition was studied from 0.7 to 3.7 d following completion of stepwise salinization. This deposition was followed in immature leaves, which had attained only 1-2 % of ultimate leaf mass by the completion of the study. In such young leaves development is still dominated by cell division. The transport of Ca# + specifically to the youngest leaves was reduced by more than twice as much as was K + transport. Transport of the other major divalent cationic nutrient, Mg# + , was not decreased for these leaves. The factors of increase for Na + and Cl − after 3.7 d after completion of salinization averaged 152 and 62 % over control levels for the three youngest leaves (for Na + and Cl − , respectively). Though significant, these increases were only 27 and 14 % as great as increases in three leaf sets of more developed growing leaves. Decreases in net K + deposition and leaf K + concentration were not greater for the youngest than they were for the oldest leaves. Net S deposition was reduced 44 % more in younger than older growing leaves, but for most leaves not beyond the level expected due to reduced sink strength. The reduction in net P deposition also seemed more related to reduced sink strength, but was reduced to approx. 50 % in both younger and more developed growing leaves. While Fe concentration was not reduced by salinization at any developmental stage, Zn# + net transport and Zn concentration were both reduced in the two youngest leaves (57 and 70 %, respectively). Given the moderate treatment imposed (Na : Ca ratio of 22) the results suggest that Ca# + transport to the youngest leaves is probably highly sensitive to salinization of the root medium and is perhaps a key physiological response in the inhibition of leaf growth.

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“…Detailed quantitative descriptions of vegetative shoot and leaf growth have been done (Avery 1933;Richards and Kavanagh 1943;Hannam 1968;Williams 1975;Poethig and Sussex 1985;Singer 1985), but comparable studies on the growth of reproductive shoots and floral organs are lacking. Here, we report the results of a growth analysis on vegetative and reproductive shoots of tobacco with the PI.…”

Section: Introductionmentioning

confidence: 99%

Rates of corolla growth in tobacco determined with the plastochron index

Hill

Malmberg

1991

Planta

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The growth of vegetative and reproductive shoots of Nicotiana tabacum L. cv. Xanthi is analyzed with the plastochron index to estimate the relationship between corolla growth and time. The plastochron of leaves 9 through 20 declines steadily at each successive node. The flower plastochron increases steadily during the growth of an individual cyme, with the most distal flower to open having the longest plastochron. Variation in the flower plastochron is the result of variation in the rate of flower initiation, not the growth rate of individual flowers. The corolla has an extended phase of approximately constant relative growth in length (between 0.2 · d(-1) and 0.3 · d(-1)) until a peak of growth (0.5 · d(-1)) 2-3 d before anthesis. Corollas also have periodic peaks and troughs of growth that are low in amplitude (0.1 · d(-1)), but persist throughout most of corolla development. The pattern of corolla expansion contrasts strongly with earlier reports of the pattern of tobacco leaf growth.

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Leaf Growth and Development in the Young Tobacco Plant

Cited by 21 publications

References 15 publications

Distribution of Assimilate During Stem Elongation in Wheat

Distribution of Assimilate During Stem Elongation in Wheat

Effects of salinization on nutrient transport to lettuce leaves: consideration of leaf developmental stage

Rates of corolla growth in tobacco determined with the plastochron index

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