Vergara - 1976 - Physiological and morphological adaptability of ri

RESPONSE TO DEEP wanna snuzss 311
Groin you tt/ho)
aa/NFED
IRRJGATED
3 _
2 r
un Mun N
I r-
0 t | | 1
Upland Lowland 0 20 40 6O B0 100
Daulhof vote! (cm)
3. Grain yield of rice varieties under different water
management conditions. IRRI. I972 wet season.
The maximum elongation per day per plant can be as high as 25 cm/day
(Alim et a1, I962". Chowdhury and Zaman. 1970). The maximum elongation
reported per day per internode is 4 em (Sugawara and Ilorikaiw-‘a. 1971) The
normal rate of elongation per plant is 2 to 1O cm/day (Yamaguchi and Sato.
1961; Chowdhury and Zaman. 19110). The longest recorded internode is 4? to
60 cm long (Alirn et a1. 1962; Singh. 1962). There is a close relationship between
the size of the leaf sheath and the length o1‘ the intemode (Yamaguchi
and Sato. 1961).
Deep water rices do not grow entirely erect but rather zigzag under the water
and have a tendency to crawl on the surface (Ramiah and Rainaswami. 1941).
These riees differ in the number of internodes they develop (Chowdhury and
Zaman. I970).
When subjected to deep water stress, the size of the air cavities in the eulm
increases (Basu ct al.. 1970; Roy. 1972), while the diameter of the cells of the
cortex and the thickness of the phloem remain constant (Basil et al.. 1970).
Tillering
Since plants are usually subjected to deep water after 4 to 8 weeks of growth,
rapid tillcring has already occurred before flooding. However. further tillcring
or branching usually occurs during flooding.