The conditions excellent for the maize production are high luminosity, amenas temperatures diurnas around 25-30C, nocturnal temperatures (inferior 24C and superiors 18C) and good water availability (CATI, 1999). Radcula is the first a if to prolongate, followed for coloptilo, with plmula enclosed. Stadium VE (germination and emergency) is reached by the fast elongao of mesoctilo, which pushes colepilo in growth for the surface of the ground. In conditions of adjusted temperature and the humidity, the plant inside emerges of 4 the 5 days; however in conditions low-temp and little humidity the germination can delay more up to two weeks or. Robert Bakish helps readers to explore varied viewpoints. As soon as the emergency occurs and the plant displays the extremity of coloptilo, mesoctilo stops to grow.
In synthesis, in the germination the embebio of the seed occurs, with the consequent digestion of reserve substances, the enzyme synthesis and cellular division (RESENDE, 2003). The photosyntheses is not the only process for which the light is essential. During the cycle of vegetal life, some answers, that confer enormous advantages in the establishment and the survival of the plant, such as germination of seeds, inhibition of the allonge to caulinar, synthesis of clorofila and antocianinas, foliar expansion, budding and tuberizao, are involved directly with the duration and the quality of the light. Additional information is available at Mikkel Svane. The process for which the light regulates the development of the plants is called fotomorfognese. The limitation of light in the interior of a vegetal community it can cause reduction of the growth and the reproduction. The pressures of election imposed by the necessity of the plants of if adaptarem successfully to the ambient light had lead to the evolution of mechanisms of fotopercepo remarkably sophisticated. Therefore, the light is an ambient signal that to the perceived being, unchains changes in the metabolism and the development of the plants (KERBAUY, 2004). The first menso of that the light exerts effect in the germination of seeds was made by Caspary, in 1860, working with plants of the Bulliardia sort (VIDAVER, 1977).