What causes elongation of Internode?

Elongated Internode. Plants of the Tall stock overproduce the plant growth regulator gibberellic acid, resulting in the elongation of the hypocotyl and stem internodes (lengths between leaf bracts). The extent of internode elongation is affected by the ambient temperature: higher temperatures accentuate the elongation.

Which stimulated Internodal elongation?

Gibberellins specifically induce internodal elongation in genetically dwarf verieties of plants like pea and maize.

What is elongation of Internode?

In contrast to hypocotyl elongation, in which only cell elongation is concerned (Gendreau et al., 1997), internode elongation is the result of both cell division and cell elongation, and hormones have different effects on these two mechanisms.

What hormone causes Internodal elongation?

2: Gibberellin hormone is the growth hormone in plants which is responsible for the growth of the plants, elongation of the inter nodes causes the growth of the plant under water.

Is responsible for growth of Internode?

Intercalary meristem increase length of plant-like apical meristems.

Is auxin a Phytohormone?

Auxin, any of a group of plant hormones that regulate growth, particularly by stimulating cell elongation in stems.

What is PR and PFR?

Exposure to red light converts the chromoprotein to the functional, active form (Pfr), while darkness or exposure to far-red light converts the chromophore to the inactive form (Pr).

What is called internode?

: an interval or part between two nodes (as of a stem)

Which hormone helps in mainly Internode growth?

Under deep-water conditions, ethylene is accumulated in the plant and this accumulation induces expression of SNORKEL1 and SNORKEL2, leading to internode elongation to escape from water submergence (Hattori et al., 2009).

Is auxin toxic to humans?

Conclusion: Human toxicity of synthetic auxins appears relatively benign with conservative treatment.

Is IAA synthetic auxin?

The most important member of the auxin family is indole-3-acetic acid (IAA), which generates the majority of auxin effects in intact plants, and is the most potent native auxin. Synthetic auxin analogs include 1-naphthaleneacetic acid, 2,4-dichlorophenoxyacetic acid (2,4-D), and many others.

Which is active PR or PFR?

Pfr is the physiologically-active form of the protein; exposure to red light yields physiological activity in the plant. Exposure to far-red light converts the Pfr to the inactive Pr form, inhibiting phytochrome activity. Together, the two forms represent the phytochrome system.

Which is an exception to the elongation of internodes?

An exception is found in the mesocotyl (first internode in grasses) which, within food reserve limits, continued, to elongate indefinitely in dark­ness or in infrared light. Growth of the mesocotyl is inhibited immediately by exposure to red light; that is, growth is phytochrome (pigment) controlled but modifiable by organic nutrition.

How does internode growth affect the growth of a plant?

Internode mass accumulation of cotton plants grown in optimum water and nutrient conditions increased as a function of internode age ( Fig. 11 ). Unlike elongation duration ( Fig. 5) and rate of elongation ( Fig. 7 ), internode growth rate (g day −1) continuously increased throughout the growing season.

Where are the internodes located on the stem?

The stem consists of internodes spaced between the nodes, with attached leaves. The number of nodes and internodes is equal to the leaf number, all three having a common origin in the phytomer.

Why does an internode have a short mean of Mean il?

Values indicating a short mean of mean IL may be due to selection of too many small fibers during teasing, selective loss of large fibers, or previous remyelination after segmental demyelination. Conversely, longer than normal mean of mean IL values may be due to selection of too many large fibers during teasing or loss of small fibers.