Farhat Nawaz

SEED DORMANCY Introduction: Seed quiescence is define as a state in which origins argon pr even offted from germinating even beneath environmental conditions normally favorable for germination.  These conditions are a multifactorial combination of water, light, temperature, gasses, mechanical restrictions, ejaculate show ups, and hormone structures. characters of seed quiescence inside and outside: * endogenetic quiescence: (outside the seed, related to the seed coat or other surround tissue), and * Exogenous quiescence: (inside the seed, related to the seed embryo). These terms are still considered helpful and relevant today (table 1). Endogenous quiescency may be due to physiological or morphologic lineaments of the seed embryo, or a combination of both (table 1). The variant types of endogenous dormancy are physiological dormancy (PD), morphological dormancy (MD) and morpho-physiological dormancy (MPD). Exogenous dormancy may be due t o a physical, chemical or mechanical characteristic of the seed coat or fruit (table 1). The different types of exogenic dormancy are physical dormancy (PY), chemical dormancy and mechanical dormancy. N.B. The following pages describe how we classify different types of exogenous and endogenous dormancies, base on our current understanding.

However this data is designed to give you to the idea of dormancy mixture and is not meant to be a definitive approach to dormancy classification since the subject is always under scientific scrutiny. Table 1. A proposed classification form for seed dormancy, attempting to locate different types of dormancy mechanisms (modified from Nikolaeva, 1 9773). Dormancy Type| Description| Further! Classification| Endogenous: Related to the seed embryo and/or endosperm| physiologic (PD)| Physiological inhibiting mechanisms (PIM) of the embryo that differs in depth.| - Deep (strong PIM) - Intermediate - Non-deep (weak PIM)| Morphological (MD)| embryo underdeveloped or...If you want to lease a full essay, nightclub it on our website: OrderEssay.net

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