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<p><strong>Tolerance mechanism in hybrid citrus rootstock progenies against <em>Phytophthora nicotianae</em> Breda de Haan</strong></p>

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Title Statement <p><strong>Tolerance mechanism in hybrid citrus rootstock progenies against <em>Phytophthora nicotianae</em> Breda de Haan</strong></p>
 
Added Entry - Uncontrolled Name Kalal, Prashant
Sharma, R M
Dubey, A K
Kamil, Deeba
S, Lekshmy
Kumar, Amrender
Awasthi, O P
 
Uncontrolled Index Term Citrus gummosis, Gum lesions, Lipid peroxidation, Pummelo, Sacaton, Trifoliate orange, Troyer
 
Summary, etc. <em>Phytophthora</em> species is the major threat for world citrus industry in general, and for India, in particular due to commercial use of susceptible rootstocks. The resistant gene possessed by <em>Poncirus</em> genus may be of immense use, if transferred in a well acclimatized citrus species which can have good impact on fruit size of scion varieties. Being a soil borne problem, development of resistant/tolerant rootstock(s) is the most eco-friendly solution to combat with this deadly disease. The present study was conducted during 2016 to understand the tolerance mechanism in the intergeneric hybrids of citrus rootstocks against <em>Phytophthora nicotianae</em>. The materials of study consisted of 30 hybrids, ten each of Pummelo (P) × Troyer (T), Pummelo (P) × Sacaton (S) and Pummelo (P) × Trifoliate orange (TO) were tested against the inoculation of <em>P. nicotianae</em>, taking Pummelo, Troyer and Citrumelo as control treatments. Of the total hybrid progenies, only six hybrids (P × TO-103, P × TO- 112, P × S-117, P × S-119, P × T-125 and P × T-130) expressed resistance against <em>P. nicotianae</em> on the basis of lesion length (nil or &lt;2.5 cm). Of the tested hybrids, P x S-117 had the highest photosynthetic rate (<em>A</em>) <br /> (8.12 µmol m<sup>-1</sup>s<sup>-1</sup>) followed by P × TO-112 and P × S-119. Excised leaf water loss (ELWL)<strong> </strong>was lowest in P × S -119 (7.47%) without having significant diference with Troyer citrange, and rest of the resistant hybrids. The highest relative leaf water content (RWC) was registered in P × T-125 (84.47%), which was similar statistically with P × T-119, P × T-103 and <br /> P × T-112 (77.59-83.42%) hybrids. Hybrid P × S -117 tended to show the highest total chlorophyll content (12.14 mg g<sup>-1</sup>FW), followed by P × TO-112 and P × T-127. P × S-117 expressed the lowest level of hydrogen peroxide (100.72 mM mg<sup>-1</sup> FW) without having any significant difference with those of P × TO-110, P × T-127 and P × T-130 hybrids. The lipid peroxidation was highest in P × T-132 (25.99 µmol g<sup>-1</sup> FW), while its lowest accumulation was in P × S-119 (6.44 µmol g<sup>-1</sup> FW) with statistically similar to P × T-130 hybrid. The highest content of glycine betain was noticed in P × TO-103, P × TO-117 and <br /> P × TO-130 (0.33 mg g<sup>-1 </sup>FW in each). Of the total hybrid progenies, highest accumulation of leaf N was found in P × T-125 (2.74%) followed by P × S -119 and P × T-130. All six resistant hybrids excelled over other hybrids in respect of leaf K<sup>+</sup> content. The content of Ca<sup>+2</sup> was highest in the leaves of P × S-117 (4.90%) having similarity statistically with P × T-125 (4.87%). The resistance of identified hybrids (P × TO-103, P × TO- 112, P × S-117, P × S-119, P × T-125 and P × T-130) against <em>P. nicotianae</em> was also evidenced by low ROS generation and ELWL, with high RWC and leaf nutrient status over other hybrids. Among the various physicochemical characters studied, only <em>A</em>, ELWL and N were found to have significant but inverse relationship with lesion length caused by <em>Phytophthora</em> inoculation.
 
Publication, Distribution, Etc. Indian Journal of Experimental Biology (IJEB)
2021-03-03 10:54:23
 
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http://op.niscair.res.in/index.php/IJEB/article/view/46975
 
Data Source Entry Indian Journal of Experimental Biology (IJEB); ##issue.vol## 59, ##issue.no## 03 (2021): IJEB [March 2021]
 
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