Types of Senescence

Types of Senescence:

Leopold in 1961 has recognized four kinds of senescence patterns, which are as illustrated below:

Whole plant senescence:

This is found in monocarpic plants that generate fruit and flower only once in their life cycle. The plants might be annual (example: rice, gram, mustard, wheat, and so on), biennials (example: cabbage, henbane) or perennials (example: certain bamboos and so on). The plant dies soon after ripening of the seeds.

2380_senescence.jpg

 Figure: kinds of senescence

Shoot senescence:

This kind of senescence is found in some perennial plants that possess underground perennating structures such as rhizomes, corm, bulbs, and so on. The ground portion of the shoot dies each year after flowering and fruiting, however the underground portion (stem and root) survives and puts out new shoots again next year. Example: banana, ginger, gladiolus, and so on.

Sequential Senescence:

This is found mostly in perennial plants in which the tips of main shoot and branches remaining a meristematic state and carry on to generate new buds and leaves. The older leaves and lateral organs such as branches exhibit senescence and die. Sequential senescence is obvious in evergreen plants. Example: Eucalyptus, Pinus and so on.

Simultaneous or Synchronous senescence:

This is found in temperate deciduous trees like elm and maple. Such plants shed all their leaves in autumn and build up new leaves in spring. Since of this shedding of leaves, autumn season is also termed as fall. Such a senescence of leaves or plant organs is termed as synchronous.

Latest technology based Biology Online Tutoring Assistance

Tutors, at the www.tutorsglobe.com, take pledge to provide full satisfaction and assurance in Abscission and Senescence homework help via online tutoring. Students are getting 100% satisfaction by online tutors across the globe. Here you can get homework help for Abscission and Senescence, project ideas and tutorials. We provide email based Abscission and Senescence homework help. You can join us to ask queries 24x7 with live, experienced and qualified online tutors specialized in Abscission and Senescence. Through Online Tutoring, you would be able to complete your homework or assignments at your home. Tutors at the TutorsGlobe are committed to provide the best quality online tutoring assistance for Biology homework help and assignment help services. They use their experience, as they have solved thousands of the Biology assignments, which may help you to solve your complex issues of Abscission and Senescence. TutorsGlobe assure for the best quality compliance to your homework. Compromise with quality is not in our dictionary. If we feel that we are not able to provide the homework help as per the deadline or given instruction by the student, we refund the money of the student without any delay.