الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
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SUMMARY
1- Identification of physiologic races of wheat leaf
rust during 1979 - 1981, revealed the existence
of races 6, 12, 57, 77, 114 and 144. J”ourty isolates
of race 77, which occupied the first rank ,
were identified during this period.
2- Wheat varieties or lines carring the Lr9, Lr 13,
L!-!2, Lx 24 and Lx 2a genes of ~esistance .ad
the widest spectrum of resistanqe being .18kly
effective to most isolated leaf ~uat races • On
the other hand, genes Lx 2d, Lr ~4a, Lx 1, Lr 10,
Lr 18, Lr 12, Lx 11, k.2” Lr 14 b and Lx 17 were
of minor importance, .ince they were poorly effective
against virulent leaf r~st races.
J- ~2 monosomic analysis BAowed that two independent
genee located on chromosomes LA and 5D controlled
resistance of Giza 155 to race 57, wherea~
resistance of Giza 157 to the same race was governed
by twod •••• &Dt complement aryl genes, located
I on caz-cmoae •• 6 :8. I
4- The two independent genes conditi Ding the reaction
of Giza 155 to race 77 were 1 cated on chromosomes
4 B and 6 D, of which chr osom. 4 B carried
gene (a) gOTeraing resistance to race, wkereas,
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ch.romosome 6 D was oontIibuting to virulence •.•v.ing
probably inhibitor gene(s) for resistance.
5- As concerns Giza 157, chromosome 5 D was found to
be involved in controlling leaf rust resistance to
race 77. ?urthermore, chromosome 4A was associated
with resistance to tbe same race, while minor genes
carried on chromosome5A could be suggested t. Aave
negative effects on resistance •
6- Higher amounts of sugar contents were observed in
all monosomes of Giz~~d Giza 157, showing susce- r.
eptible reactionJ3 to races 57 and 77, indicating
that susceptibility was characterized by variable
degrees of incrmnent in levels of total, reducing
and non-reducing sugars.
7- Resistant seedlil~a derived from monosomy lA ef
Giza 155, 1•• culated with race 57, contaiRed higher
amounts of t.e amino acids Cysteine; Histidine,
Arginine and to some extent of Leucine - I•• leuciae
taan tlle susceptj.ble ones.
8- Resistant seedlings of monosomy 5D of Giza 155 were
c.b.araoter~z.d by tAe presence of ll1g)ler amount er
!yrosine, Valille and PheD,yJalanine , abaeace er Proline
and 10••• t ’V’slueof Lysine, than tlte IIWIceptible
seedli... inooulated with race 51.
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9- Resistant seedlings derived from monoSQmy 7A er Giza
157 contained higker amounts of Cysteine and Tyre. _
ine; while those of monosomy 6 B contained kigher amounts
of aysteine, Histidine, Tyrosine and Pkenylalanine
than tAeir susceptible seedlings.
10- In tests wit. race 77, amino acids analysis indicated
taat the resistant seedlings of monosamy 6 D ef Giza
.155 were characterized by the presence of k1gker levels
of Cysteine, Histidine, Tyrosine and paeuyIalanine;
while tke resistant seedlings of monOSQmes 4 A
and 5 D of Giza 157 contained higher levels ef Glut-
8.Ilic acid ..T•h.reonine, Alaaine, Tyrosine, Valine ,
Phenylalanine and Leucine +Isoleucine ae compared
with Busceptible seedlings.
11- No marked differences in amounts of total, tree and
conjugated phenols were noticed between res1atamt and
susceptible Seedlings of monosomy lA of Giza 155,
when inoculated with race 57.
12- High levels of total and free phen.Is were detected in
the resistant seedlings of mOnoBomy 5 D of Giza 155
carrying genes ot resistance to race 57.
13- ReSistant aeedliQgs of monosomic family 7A of Giza 157
contained lower total and free phenols tJaan t..8uaceptible
ones, inooulated with race 57.
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14- W~en -iAoculated with race 11, resistant se~~lings
at tke family 6D of Giza 155 exhibited higher amounts
of tke three forms of phenolic compounds as
compared with susceptible seedlings.
15- The effect of resistance genes to race 77 carried
on chromosome 5D of Giza 151 was reflected by producing
higher levels of total and free pAenols in
the resistant combinations.
16- The total and conjugated phenols Were higher in the
inoculated resistant seedlings of monosomic family
4A of Giza 151 than in the susceptible seedlings
when inoculated with race 71.
17- Peroxidase enzyme activity was higher in susceptible
seedlings of all monosomic lines of wheat varieties
Giza 155 and Giza 157, inoculated With either
race 51 or 77 af leaf, rust.
18- No general trend was observed concerning catalase
enzyme activity in resistant and susceptible seedlings
of tJae different monosomic lines • .l4onosomes
5D and 6D of Giza 155 which were either inoculated
wit. race 57 or 77. ezbib1ted higher activ1t7 in
susceptible seedlings tA8D in resistant ones. on tae
contrary, monosomefl 7A and 4A of Giza 157 s1lowed
lower activity in susceptible than in resistant seedlings.
Similar .~tivities were measured in both
susceptible and resistant seedlings or monosomic
lines 6 Band 5 D of Giza l5~ inoculated witk race,
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57 and 77, respectively.
19- Susceptible seedlings of all monosomes. inoculated with
race 57 exhibited higher activity of ascorbic acid oxidase
than resistwlt ones. With regard to race 77, no
activity was determined in suseeptible seedlings of all
monosomic lines and also in inoculated resistant seedling
of monoBomy 5D of Giza 157.
20- No activity of plIly ph eneL oxidase enzyme CQuld be detected
in any of mcmosomic lines of Giza 155 and GilSa ~57,
when inoculated wi.th either race 57 or .