More known. It has recently been shown that

More than 30 genes have been identified in
the yeast that are involved in various steps of autophagy. Many of these genes
have mammalian homologues, and many homologs are found in plants (Hanoaka
et al., 2002). Although the functions of some of the ATG genes in Arabidopsis
have been studied, their detailed role in autophagy is not known. It has
recently been shown that the ATG gene associated with the formation of
autophagosomes has been coordinated at the onset of starvation, which indicates
the role played by the incident caused by starvation (Rose et al., 2005). It is
anticipated that an ubiquitin-like protein, Atg8, as markers to monitor the plant autophagy
is convenient since it is useful in other organisms.( Contento et al., 2005). Atg8
with a PE lipid molecules with similar ubiquitination reaction has been
modified; As a result, Atg8-PE acts as an intrinsic membrane protein and forms
PE-conjugated in the formation of autophagosomes. Atg8 is attached to the PE
localized to the autophagosomes and their intermediates, and eventually part of
it is transferred to vacuole during autophagy. Therefore, Atg8 is a useful
molecular marker for monitoring the autophagy process  in yeast (Kirisako et al., 1999).

plants of Atatg mutant , which have been
described, can produce normal embryogenesis, germination, cotyledon
development, shoots and roots elongation, flowering, and seed production under
conditions rich in common nutrients. However, accurate phenotypic analysis
revealed the differences between wild-type and Atatg mutations (Xiong et al.,
2005; Thompson et al., 2005). In Atatg mutations,even in tnutrient-rich
conditions, the senescence of the leaves accelerates. In addition, bolting, the
production of inflorescence (floral) stems, of Atatg9-1 is accelerated under
normal conditions (Hanoaka et al., 2002). These results indicate that autophagy
plays an important role in natural processes even in nutrient-rich conditions. In
Atatg mutations, degradation of chlorophyll is accelerated in comparison with wild-type
plants; Therefore, it seems that autophagy is not required for the destruction
of chloroplast proteins. This
result is consistent with the idea that the destruction of chloroplast proteins occurs
during the of leaf senescence within the chloroplasts itself (Hortensteiner and
 Feller, 2002).

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(Yoshimoto et al.,
2009)  Several evidence suggests that
plant autophagy plays a different role in nutrient recycling. We found that the
atg2 and atg5 mutants in both short and daily terms, even when sufficient
nutrients are present, show early senescence phenotypes.