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Effect of storage, photoperiod and mechanical scarification on seed germination in Ocimum americanum
Author(s) -
Amritphale Dilip,
Mukhiya Y. K.,
Gupta J. C.,
Iyengar Shamanta
Publication year - 1984
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1984.tb05185.x
Subject(s) - photoperiodism , germination , scarification , biology , ocimum , population , horticulture , red light , botany , far red , dormancy , medicine , environmental health
Seeds of Ocimum americanum L. display an absolute light requirement for germination. The minimal length of the daily photoperiod required to induce a high germination decreased with increasing seed age, but the length of the photoperiod under potential control of terminal far‐red light inhibition remained unchanged. There was a gradual escape from the far‐red inhibition with increase in the length of the photoperiod. Seeds developed flash photosensitivity after the first 13 h photoperiod. Scarification treatment did not allow the seeds to bypass the light requirement, but it enhanced the germination considerably. Under conditions of natural day length in the field, weakening of the testa by sand may abolish the need for a second exposure to light for most of the seed population, thus rendering them non‐photoperiodic.