ANALYSIS OF YIELD PRODUCTION PROCESS IN S WEET SORGHUM (SORGHUM-BICOLOR MOENCH) .1. ELONGATION PATTERNS OF LEAF BLADE, LEAF SHEATH AND ELONGATED INTERNODE
S. Nakamura et al., ANALYSIS OF YIELD PRODUCTION PROCESS IN S WEET SORGHUM (SORGHUM-BICOLOR MOENCH) .1. ELONGATION PATTERNS OF LEAF BLADE, LEAF SHEATH AND ELONGATED INTERNODE, Nippon Sakumotsu Gakkai Kiji, 64(1), 1995, pp. 43-49
The harvest object of a sweet sorghum plant is all parts of shoot whic
h mainly consists of a juicy main stem, leaf blades and leaf sheaths.
To obtain higher yield, it is important to understand in detail the yi
eld production process. However, little has been known about plant age
for sweet sorghum, which is an important parameter to predict the gro
wth patterns of elongated internode (IN : defined as that having great
er than or equal to 1.0 cm), leaf blade (LB) and leaf sheath (LS). Thu
s, here we developed a new index of plant age (AL) by using the positi
on of a fully expanded leaf on the stem. This study was conducted to c
larify the elongation patterns of IN, LB and LS. Two cultivars, Syrup
sorgo 2 (S2, a late-maturing) and Hybrid sorgo (HS, a medium-maturing)
, were gorwn under the field condition in 1992. A conceptional growth
curve of IN, LB and LS was drawn by plotting their percentages of elon
gation on AL. IN (n) (n : natural number) began to elongate at AL(n 1), rapidly elongated at AL (n + 2) and reached its maximum length at
AL (n + 3) similar to AL (n + 4). LB (n) rapidly elongated at AL (n -
4) similar to AL (n - 2) and reached its maximum length at AL (n - 1).
LS (n) rapidly elongated at AL (n - 1),reached its maximum length at
AL (n) similar to AL (n + 1). Thus, AL can serve as an effective means
of identifying the stage of IN, LB and LS development during the inte
rnode elongation stage.